June 18, 2025

Case Study | Bignall Park Barns | Bicester

Bicester, Oxfordshire

At A Glance:

Products Supplied:

Comprising: A single tank solution based around a SPEL Tankstor 400 Series (2.6m diameter) with 45,500 litre capacity.
SPEL provided the required air blowers, circulation pumps and associated control panels and air manifolds as a complete Packaged Sewage Treatment plant system supplied and commissioned by SPEL
The settlement area and following sewage treatment processes were all included within a single tank on this project, allowing for rapid and simple installation.

This office facility is designed to meet the needs of small and medium sized businesses. The offices have been converted from stone-built farm buildings to give a very high quality, English finish, with modern office facilities including meeting rooms, individual business office areas and much more to meet the businesses requirement. The location is very close to the M40 and A34 as well as nearby good rail locations such as the Bicester Village Train Station.

SPEL designed and manufactured one of our SPEL Purafluent package sewage treatment plants for this project. The requirement was for a package sewage treatment plant that would treat the sewage waste from the 250 office workers (with no canteen facility), 10 domestic residents and 10 shower facilities. The discharge effluent standard required by the Environment Agency was 20:30:10 (expressed as mg/l BOD:SS:Ammonia). The SPEL Tankstor used for this sewage treatment plant was a single SPEL Tankstor 400 Series (2.6m diameter) with 45,500 litres capacity.

For larger flow rates and/or for stricter discharge consents, SPEL often design a system involving multiple tanks. Alongside our sewage treatment specialist, SPEL can design a system to suit your requirement for any projects with a population in excess of 100 people.

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Model	Series	Meals per Day*	NSG	Tank Length (mm)	Internal Diameter (mm)	Overall Capacity (L)	Grease Capacity (L)	Inlet Invert (m)	Base to Inlet (mm)	Base to Outlet(mm)	Optimum In/Out Pipe Diameter** (mm)	Number of Access Shafts (dia. mm)
				L				A	B	C		600
GS200/2000	200	400	4	2,040	1,200	2,000	160	1,020	1,000	940	160	2
GS200/3000	200	600	6	2,930	1,200	3,000	240	1,020	1,000	940	160	2
GS200/4000	200	900	9	3,810	1,200	4,000	360	1,020	1,000	940	160	2
GS200/5000	200	1100	11	4,700	1,200	5,000	440	1,020	1,000	940	160	2
GS200/6000	200	1400	14	5,578	1,200	6,000	560	1,020	1,000	940	160	2
GS300/5860	300	1400	14	2,690	1,800	5,860	560	1,600	1,600	1,550	160	2
GS300/9270	300	1800	18	4,015	1,800	9,270	720	1,600	1,600	1,550	160	2
GS300/18200	300	4000	40	7,620	1,800	18,200	1600	1,600	1,600	1,550	160	2

Model	Series	Max. Flow*	Silt Capacity (L)	Overall Length*	Internal Diameter (mm)	Opt In/Out Pipe Diameter (mm)	Number of Access Shafts (dia. mm)	Inlet Invert (mm)
		Flow (l/s)		L			600	A
WDS 200/1000	200	1.1	250	1.17	1,200	160mm	1	–
WDS 200/2000	200	2.2	500	2.05	1,200	160mm	1	–
WDS 200/3000	200	3.3	700	2.93	1,200	160mm	1	–
WDS 200/4000	200	4.5	1,000	3.82	1,200	160mm	1	–
WDS 200/5000	200	5.6	1,250	4.7	1,200	160mm	1	–
WDS 200/6000	200	6.7	1,500	5.59	1,200	160mm	1	–
WDS 200/7000	200	7.8	1,750	6.48	1,200	160mm	1	–
WDS 200/8000	200	9	2,000	7.36	1,200	160mm	1	–
WDS 200/9000	200	10	2,250	8.25	1,200	160mm	1	–
WDS 200/10,000	200	11	2,500	9.13	1,200	160mm	1	–
WDS 300/4000	300	5	1,000	1.95	1,800	160mm	1	–
WDS 300/6000	300	7	1,500	2.76	1,800	160mm	1	–
WDS 300/8000	300	9	2,000	3.54	1,800	160mm	1	–
WDS 300/10,000	300	12	2,500	4.29	1,800	160mm	1	–

Model	Series	Nominal Size (NB)	Catchment Area (M2)	Oil Storage (L)	Silt Capacity (L)	Overall Length* (mm)	Overall Diameter (mm)	Inlet Invert (mm)	Base to Inlet (mm)	Base to Outlet (mm)	Optimum In/Out pipe Diameter** (mm)	Number of Access Shafts (dia. mm)
		Flow (l/s)						A	B	C		450	600	750
FR004 SC	200	4	222	40	400	1,720	1225	630	1,110	1,050	160		1
FR006 SC	200	6	333	60	600	2,270	1,225	630	1,110	1,050	160		1
FR010 SC	200	10	556	100	1,000	3,410	1,225	630	1,110	1,050	160		1
FR015 SC	300	15	833	150	1,500	2,760	1,875	350	1,800	1,740	225			1
FR020 SC	300	20	1,111	200	2,000	3,200	1,875	350	1,800	1,740	225			1
FS2 SC	300	20	1,111	200	2,000	4,290	1,875	350	1,800	1,740	225			1
FR030 SC	300	30	1,667	300	3,000	4,420	1,875	390	1,760	1,700	300			1
FR040 SC	300	40	2,222	400	4,000	5,760	1,875	390	1,760	1,700	300			1
FR050 SC	300	50	2,778	500	5,000	7,060	1,875	390	1,760	1,700	300			1
FR065 SC	400	65	3,611	650	6,500	4,810	2,700	425	2,625	2,525	300	1	1
FR080 SC	400	80	4,444	800	8,000	5,700	2,700	425	2,625	2,525	300	1	1
FR100 SC	400	100	5,555	1,000	10,000	7,400	2,700	475	2,575	2,475	450	1	1
FR125 SC	400	125	6,944	1,250	12,500	8,580	2,700	475	2,575	2,475	450	1	1
FR150 SC	400	150	8,333	1,500	15,000	10,180	2,700	475	2,575	2,475	450	1	1
FR165 SC	400	165	9,166	1,650	16,500	11,200	2,700	500	2,550	2,450	450		2
FR200 SC	400	200	11,110	2,000	20,000	13,710	2,700	660	2,390	2,290	600		2
FR250 SC	400	250	13,888	2,500	25,000	16,750	2,700	660	2,390	2,290	600		2

Model	Series	Nominal Size (NB)	Catchment Area (M2)	Oil Storage (L)	Silt Capacity (L)	Overall Length* (mm)	Overall Diameter (mm)	Inlet Invert (mm)	Base to Inlet (mm)	Base to Outlet (mm)	Optimum In/Out pipe Diameter** (mm)	Number of Access Shafts (dia. mm)
		Flow (l/s)						A	B	C		450	600	750
FR040	300	40	2,222	400		4,020	1,875	390	1,760	1,700	300			1
FR050	300	50	2,778	500		5,070	1,875	390	1,760	1,700	300			1
FR065	400	65	3,611	650		3,710	2,700	425	2,625	2,525	300	1	1
FR080	400	80	4,444	800		4,400	2,700	425	2,625	2,525	300	1	1
FR100	400	100	5,555	1000		5,250	2,700	475	2,575	2,475	450	1	1
FR125	400	125	6,944	1250		6,090	2,700	475	2,575	2,475	450	1	1
FRI50	400	150	8,333	1500		7,400	2,700	475	2,575	2,475	450	1	1
FR165	400	165	9,166	1650		7,960	2,700	500	2,550	2,450	450		2
FR200	400	200	11,110	2000		9,600	2,700	660	2,390	2,290	600		2
FR250	400	250	13,888	2500		11,830	2,700	660	2,390	2,290	600		2
FR300	400	300	16,665	3000		14,120	2,700	660	2,390	2,290	600		2
FR400	500	400	222,222	4,000	optional	*	3,650					–	3	–

*Overall length subject to inlet/outlet size and orientation

**SPEL Separators are designed for a maximum flow (NS/NSB) but can be fitted with larger than the recommended maximum connection size IN/OUT or with the addition of adapters providing the maximum flow (NS/NSB) cannot be exceeded or any increase in the operating level in the SPEL Separator to cause the captured pollutants to escape into the vent connections or through access shaft connections. Any overriding of the above criteria could jeopardise performance to the European Standard BS EN 858-1.

Note: Model FS2SC is a special forecourt unit with 7600 litre spillage holding capacity.

Model	Series	Nominal Size (NS)	Catchment Area (m2)	Oil Storage (L)	Silt Capacity (L)	Overall Length* (mm)	Overall Diameter (mm)	Inlet Invert (mm)	Base to Inlet (mm)	Base to Outlet (mm)	Optimum In/Out Pipe Diameter** (mm)	Number of Access Shafts (dia. mm)
		Flow (l/s)				L		A	B	C		450	750	900	1200
P006 2C/SC/NG	200	6	333	60	600	3,050	1225	427	1,110	1,050	160	–	1	1	–
P010 2C/SC/NG	200	10	556	100	1,000	4,700	1,225	427	1,110	1,050	160	–	3	–	–
P015 2C/SC/NG	300	15	833	150	1,500	4,020	1,875	540	1,610	1,550	225	–	3	–	–
P020 2C/SC/NG	300	20	1,111	200	2,000	4,020	1,875	540	1,610	1,550	225	–	3	–	–
P025 2C/SC/NG	300	25	1,389	250	2,500	4,290	1,875	540	1,610	1,550	225	–	3	–	–
P030 2C/SC/NG	300	30	1,667	300	3,000	5,070	1,875	550	1,600	1,500	300	–	2	1	–
P040 2C/SC/NG	300	40	2,222	400	4,000	6,570	1,875	550	1,600	1,500	300	–	2	1	–
P050 2C/SC/NG	300	50	2,778	500	5,000	8,260	1,875	550	1,600	1,500	300	–	2	1	–
P065 2C/SC/NG	300	65	3,611	650	6,500	10,220	1,875	550	1,600	1,500	300	1	2	1	–
P065 2C/SC/NG	400	65	3,611	650	6,500	5,470	2,700	665	2,385	2,285	300	1	1	1	–
P080 2C/SC/NG	400	80	4,444	800	8,000	6,170	2,700	665	2,385	2,285	300	1	1	1	–
P100 2C/SC/NG	400	100	5,555	1,000	10,000	7400	2,700	665	2385	2285	450	1	1	1	–
P125 2C/SC/NG	400	125	6,944	1,250	12,500	9,600	2,700	765	2,285	2,185	450	1	2	–	1
P150 2C/SC/NG	400	150	8,333	1,500	15,000	11,200	2,700	790	2,280	2,180	450	1	2	–	1
P200 2C/SC/NG	400	200	11,110	2,000	20,000	16,400	2,700	940	2,130	2,030	600	2	2	–	1
P300 2C/SC/NG	500	300	16,665	3,000	30,000	12,530	3,650	875	3,000	2,900	600	2	2	–	1
P400 2C/SC/NG	500	400	22,220	4,000	40,000	16,330	3,650	875	3,000	2,900	600	3	2	2	–

Model	Series	Nominal Size (NS)	Catchment Area (m2)	Oil Storage (L)	Silt Capacity (L)	Overall Length* (mm)	Overall Diameter (mm)	Inlet Invert (mm)	Base to Inlet (mm)	Base to Outlet (mm)	Optimum In/Out Pipe Diameter* (mm)	Number of Access Shafts (dia. mm)
		Flow (l/s)				L		A	B	C		750	900	1200
FP 1C/SCClass 1 Forecourt SeparatorSingle Chamber with Silt Capture	300	20	1,111	200	2,000	4,290	1,875	350	1,800	1,740	225	1	–	–
FP 2C/SCClass 1 Forecourt SeparatorTwo Chamber with Silt Capture	300	20	1,111	200	2,000	5,500	1,875	350	1,800	1,740	225	2	–	–
FS2 SCClass 2 Forecourt SeparatorSingle Chamber with Silt Capture	300	20	1,111	200	2,000	4,290	1,875	350	1,800	1,740	225	–	–	1

Model	Nominal Size (NSB)	Peak Flow (l/s)	Catchment Area (m2)	Oil Storage (L)	Silt Storage (L)	Length (mm)	Internal Diameter (mm)	Inlet Invert (mm)	Base to Inlet (mm)	Base to Outlet (mm)	Optimum in/out Pipe Diameter (mm) for Orientation*	Number of Access Shafts A-C Diameter (mm)
	Flow (l/s)			NSB x 15	NSB x 100	L	W	A	B	C			750*	900
103 C1/SC	3	30	1,667	45	300	1,550	1,300	500	1,015	965	160		–	–
204 C1/SC	4	40	2,222	60	400	1,860	1,200	550	1,350	1,300	300		1	–
206 C1/SC	6	60	3,333	90	600	2,120	1,200	550	1,350	1,300	300		1	–
208 C1/SC	8	80	4,444	120	800	2,270	1,200	550	1,350	1,300	300		1	–
210 C1/SC	10	100	5,556	150	1,000	2,920	1,200	550	1,350	1,300	300		1	–
212 C1/SC	12	120	6,667	180	1,200	3,570	1,200	560	1,350	1,300	300		1	–
215 C1/SC	15	150	8,333	225	1,500	4,237	1,200	560	1,350	1,300	300		1	–
320 C1/SC	20	200	11,111	300	2,000	3,200	1,800	700	1,450	1,350	450		–	–
325 C1/SC	25	250	13,889	375	2,500	3,540	1,800	700	1,450	1,350	450		–	–
330 C1/SC	30	300	16,667	450	3,000	4,420	1,800	700	1,450	1,350	450		1	1
340 C1/SC	40	400	22,222	600	4,000	5,760	1,800	740	1,410	1,310	450		1	–
345 C1/SC	45	450	25,000	675	4,500	6,570	1,800	740	1,410	1,310	450		1	–
350 C1/SC	50	500	27,778	750	5,000	7,060	1,800	740	1,410	1,310	450		1	–
460 C1/SC	60	600	33,333	900	6,000	4,400	2,600	950	2,100	2,000	600		1	1
470 C1/SC	70	700	38,889	1,050	7,000	5,250	2,600	950	2,100	2,000	600		1	1
480 C1/SC	80	800	44,444	1,200	8,000	6,170	2,600	950	2,100	2,000	600		1	1
4100 C1/SC	100	1,000	55,556	1,500	10,000	7,400	2,600	1,100	1,950	1,850	750		1	1
4125 C1/SC	125	1,250	69,444	1,875	12,500	9,050	2,600	1,100	1,950	1,850	750		1	1
4150 C1/SC	150	1,500	83,333	2,250	15,000	9,950	2,600	1,100	1,950	1,850	750		–	2
4160 C1/SC	160	1,600	88,889	2,400	16,000	11,830	2,600	1,250	1,800	1,700	750		1	2
5180 C1/SC	180	1,800	100,000	2,700	18,000	7,470	3,500	1,185	2,690	2,550	900		1	2
5200 C1/SC	200	2,000	111,000	3,000	20,000	8,530	3,500	1,185	2,425	2,325	1,200		1	2
5250 C1/SC	250	2,500	139,000	3,750	25,000	10,040	3,500	1,185	2,425	2,325	1,200		1	2
6300 C1/SC	300	3,000	167,000	4,500	30,000	10,310	4,000	1,325	2,850	2,675	1,200		1	2
6350 C1/SC	350	3,500	194,000	5,250	35,000	11,500	4,000	1,325	2,850	2,675	1,200		2	3
6400 C1/SC	400	4,000	222,000	6,000	40,000	12,690	4,000	1,325	2,850	2,675	1,200		2	3
6500 C1/SC	500	5,000	278,000	7,500	50,000	15,870	4,000	1,325	2,850	2,675	1,200		2	4
6600 C1/SC	600	6,000	333,000	9,000	60,000	18,260	4,000	1,325	2,850	2,675	1,200		1	4
6700 C1/SC	700	7,000	389,000	10,500	70,000	22,250	4,000	1,325	2,850	2,675	1,200		2	5
6500 C1	500	5,000	27.8	7,500	Nil	11,910	4,150	1,325	2,850	2,675	1,200		1	4
6600 C1	600	6,000	33.3	9,000	Nil	13,510	4,150	1,325	2,850	2,675	1,200		1	4
6700 C1	700	7,000	38.9	10,500	Nil	16,650	4,150	1,325	2,850	2,675	1,200		1	5
6800 C1	800	8,000	44.4	12,000	Nil	19,890	4,150	1,325	2,850	2,675	1,200		1	6

Model	Series	Treated Flow Rate (l/s)	Maximum Design Storm Flow (l/s)	Catchment area* (m²)	Head Loss Storm Flow (mm)	Overall Diameter (mm)	Overall Chamber Height (mm)	Inlet to Base (mm)	Inlet Invert (mm)	Silt Capacity (L)	Hydrocarbon Capacity (L)	Pipe Size dia. (mm)	Access Opening (mm)
SHV 200/30	200	30	122	4,000	180	1,225	2,680	1,600	1,080	360	220	300	Ø750
SHV 300/70	300	70	280	9,333	255	1,825	3,800	2,400	1,400	1,200	900	450	Ø900
SHV 400/200	400	200	650	26,665	350	2,700	5,000	3,300	1,700	3,450	2,000	600	Ø1,200
SHV 500/400	500	400	900	53,333	500	3,540	5,390	3,000	2,390	5,000	4,800	750	Ø1,200

Model	Series	Max. Flow (l/s)	Catchment Area Based on 65mm/hr	Oil Storage (L)	Silt Capacity (L)	Tank Length (mm)	Internal Diameter (mm)	Inlet Invert (mm)	Base to Inlet (mm)	Base to Outlet (mm)	Optimum in/out Pipe Diameter* (mm)	Number of Access Shafts (dia. mm)
								A	B	C		450	600	750	900	1,200
P004/1C/ESR	200	4	222	40	400	1,710	1,220	630	1,110	1,050	160	–	–	1	–	–
P006/1C/ESR	200	6	333	60	600	2,310	1,220	630	1,110	1,050	160	–	–	1	–	–
P010/1C/ESR	200	10	556	100	1,000	3,400	1,220	630	1,110	1,050	160	–	–	1	–	–
P015/1C/ESR	300	15	833	150	1,500	3,200	1,800	350	1,800	1,740	225	1	–	1	–	–
P020/1C/ESR	300	20	1,111	200	2,000	3,540	1,800	350	1,800	1,740	225	–	1	1	–	–
P030/1C/ESR	300	30	1,667	300	3,000	4,420	1,80	390	1,760	1,700	300	–	1	–	1	–
P040/1C/ESR	300	40	2,222	400	4,000	5,760	1,800	390	1,760	1,700	300	–	1	–	1	–
P050/1C/ESR	300	50	2,778	500	5,000	7,060	1,800	390	1,760	1,700	300	–	1	–	1	–
P065/1C/ESR	400	65	3,611	650	6,500	4,810	2,600	425	2,625	2,525	300	–	1	–	2	–
P080/1C/ESR	400	80	4,444	800	8,000	5,700	2,600	425	2,625	2,525	300	–	1	–	2	–
P100/1C/ESR	400	100	5,555	1,000	10,000	7,400	2,600	475	2,575	2,475	450	–	1	–	2	–
P125/1C/ESR	400	125	6,944	1,250	12,500	8,580	2,600	475	2,575	2,475	450	–	–	1	2	–
P150/1C/ESR	400	150	8,333	1,500	15,000	10,180	2,600	475	2,575	2,475	450	–	–	1	2	–
P165/1C/ESR	400	165	9,166	1,650	16,500	11,200	2,600	500	2,550	2,450	450	–	–	1	2	–
P200/1C/ESR	400	200	11,110	2,000	20,000	13,710	2,600	660	2,390	2,290	600	–	1	2	1	–
P250/1C/ESR	400	250	13,888	2,500	25,000	16,750	2,600	660	2,390	2,290	600	–	1	2	2	–
P280/1C/ESR	400	280	15,555	2,800	28,000	18,800	2,600	660	2,390	2,290	600	–	1	2	2	–
P300/1C/ESR	500	300	16,665	3,000	30,000	12,410	3,500	805	3,070	2,970	750	–	1	2	2	–
P400/1C/ESR	500	400	22,220	4,000	40,000	15,760	3,500	805	3,070	2,970	750	–	2	2	2	–
P500/1C/ESR	500	500	27,775	5,000	50,000	20,530	3,500	955	2,920	2,820	900	–	2	2	1	1
P500/1C/ESR	600	500	27,775	5,000	50,000	16,040	4,000	925	3,250	3,150	900	–	2	2	1	1
P600/1C/ESR	600	600	33,330	6,000	60,000	19,080	4,000	925	3,250	3,150	900	–	2	2	–	2
P700/1C/ESR	600	700	38,888	7,000	70,000	21,470	4,000	925	3,250	3,150	900	–	3	2	3	–
P800/1C/ESR	600	800	44,440	8,000	80,000	23,020	4,000	925	3,250	3,150	900	–	3	2	2	1
P900/1C/ESR	600	900	49,846	9,000	90,000	24,658	4,000	925	3,250	3,150	900	–	3	2	–	3

Model	Series	Treated Flow Rate	Maximum Flow	Connectible / Catchment area (m²)*	Oil Storage (litres)	Silt Capacity (litres)	Tank Length (mm)	Internal Diameter (mm)	Inlet Invert (mm)	Base to Inlet (mm)	Base to Outlet (mm)	Optimum in / out pipe diameter ** (mm)	Number of Access Shafts A-C*** (dia. mm)
							L		A	B	C			750	900	1200
210C1/ESR	200	10	100	1,333	150	1,000	2,920	1,220	550	1,350	1,300	300		1	–	–
212C1/ESR	200	12	120	1,600	180	1200	3,570	1,220	550	1,350	1,300	300		1	–	–
215C1/ESR	200	15	150	2,000	225	1,500	4,237	1,220	550	1,350	1,300	300		1	–	–
320C1/ESR	300	20	200	2,665	300	2,000	3,200	1,800	700	1,450	1,350	450		–	–	–
325C1/ESR	300	25	250	3,333	375	2,500	3,535	1,800	700	1,450	1,350	450		–	–	–
330C1/ESR	300	30	300	4,000	450	3,000	4,420	1,800	700	1,450	1,350	450		1	1	–
340C1/ESR	300	40	400	5,333	600	4,000	5,760	1,800	740	1,410	1,310	450		1	–	–
345C1/ESR	300	45	450	6,000	675	4,500	6,563	1,800	740	1,410	1,310	450		1	–	–
350/C1/ESR	300	50	500	6,665	750	5,000	7,060	1,800	740	1,410	1,310	450		1	–	–
460C1/ESR	400	60	600	8,000	900	6,000	4,400	2,600	950	2,100	2,000	600		1	1	–
470C1/ESR	400	70	700	9,333	1,050	7,000	5,250	2,600	950	2,100	2,000	600		1	1	–
480C1/ESR	400	80	800	10,665	1,200	8,000	6,170	2,600	950	2,100	2,000	600		1	1	–
4100C1/ESR	400	100	1,000	13,333	1,500	10,000	7,400	2,600	1,100	1,950	1,850	750		1	1	–
4125C1/ESR	400	125	1,250	16,665	1,875	12,500	9,000	2,600	1,100	1,950	1,850	750		1	1	–
4150C1/ESR	400	150	1,500	20,000	2,250	15,000	9,930	2,600	1,100	1,950	1,850	750		–	2	–
4160C1/ESR	400	160	1,600	21,333	2,400	16,000	11,830	2,600	1,250	1,950	1,850	750		1	2	–
5180C1/ESR	500	180	1,800	24,000	2,700	18,000	7,472	3,500	1,185	2,690	2,550	900		1	2	–
5200C1/ESR	500	200	2,000	26,665	3,000	20,000	8,530	3,500	1,185	2,570	2,355	1,200		1	2	–
5250C1/ESR	500	250	2,500	33,333	3,750	25,000	10,040	3,500	1,185	2,690	2,355	1,200
6300C1/ESR	600	300	3,000	40,000	4,500	30,000	10,310	4,000	1,325	2,850	2,675	1,200		1	2	–
6350C1/ESR	600	350	3,500	46,665	5,250	35,000	11,500	4,000	1,325	2,850	2,675	1,200		2	3	–
6400C1/ESR	600	400	4,000	53,333	6,000	40,000	12,690	4,000	1,325	2,850	2,675	1,200		2	3	–
6500C1/ESR	600	500	5,000	66,665	7,500	50,000	15,880	4,000	1,325	2,850	2,675	1,200		2	4	–
6600C1/ESR	600	600	6,000	80,000	9,000	60,000	18,256	4,000	1,325	2,850	2,675	1,200		1	5
6700C1/ESR	600	700	7,000	93,333	10,500	70,000	22,250	4,000	1,325	2,850	2,675	1,200

Case Study | Bignall Park Barns | Bicester

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