Teams and drivers

After 2004 saw the BTCC boasting its largest number of entries since the height of the Super Touring era in the 1990s, the following season brought a significant decline in interest. Proton and Honda pulled their manufacturer support from the series, with many of the smaller independent teams also deciding against returning.

Reigning champions Vauxhall stayed on as one of the two remaining manufacturers, dropping its Astra Coupe after four straight titles with the chassis, and introducing the all new Astra Sport Hatch (again prepared by Triple 8). Reigning champion James Thompson had left the BTCC to contest the World Touring Car Championship with Alfa Romeo, leaving the 2004 runner-up and 2003 champion Yvan Muller to head the team. SEAT Cupra Cup graduate Gavin Smith joined the team after appearing in an Astra Coupe for GA Motorsport at one meeting in 2004, and Colin Turkington moved into Thompson's seat after two promising seasons with the WSR MG squad.

Their only manufacturer opposition came from SEAT, expanding their effort to three Super 2000-spec Toledos for their second season. 2001 champion Jason Plato remained as team leader, but Rob Huff departed to join the Chevrolet WTCC campaign. He was replaced by Luke Hines, moving from Vauxhall, with James Pickford taking the third seat as reward for winning the SEAT Cupra Cup in 2004.

Team Dynamics took a brave gamble by replacing their Honda Civic Type Rs with a pair of brand new, self-developed Integras. Matt Neal and Dan Eaves remained as drivers. A third car was entered late in the season for Gareth Howell in order to support Neal's title campaign. West Surrey Racing again campaigned the MG ZS as an independent entry after MG Rover withdrew their support at the end of 2003. Rob Collard moved from his self-run Astra Coupe to fill Colin Turkington's seat, but a second driver with sufficient budget could not be found.

Arena Motorsport also continued their campaign despite losing manufacturer support, entering a single Honda Civic Type-R for the returning Tom Chilton from the second round onwards. A second entry for Alan Morrison was also registered but never raced.

The only other full-time returnees were Synchro Motorsport, with James Kaye driving their ex-works Civic Type-R once again.

Two new squads joined the series, both on very low budgets. SpeedEquipe (as HPI Racing) graduated from the Renault Clio Cup together with their drivers Richard Williams and Ian Curley, to run Lexus IS200s, while Fast-Tec Motorsports and team owner/driver Mark Proctor moved from the SCSA stock car series to run the Astra Coupe that Rob Collard had taken to the Independents title in 2003.

Kartworld Racing returned mid-season with team principal Jason Hughes again racing an ex-works MG ZS, as did Tech-Speed Motorsport running their Astra Coupe (now bio-ethanol powered) for rookie Fiona Leggate. Daniels Motorsport entered another Astra Coupe for Andy Neate for the final round at Brands Hatch.

Gary Ayles' team intended to enter a single Alfa Romeo 156 for Jamie Spence (with a possible second entry for Stefan Hodgetts also mentioned) and John Batchelor intended to return to the driver's seat in the Super 2000 Honda Civic but this, under the Team Firstserve Group banner, neither of these entries eventuated.

Other changes

• Dunlop were announced as the new title sponsor of the series^[1]
• The grid for race three was determined by race two's finishing order but with the top ten positions reversed. In 2004 this rule had applied to race two based on the finishing order of race one.
• The cars of the championship's top five drivers carried "Championship Ballast" for each race meeting's practice, qualifying and first race. Success Ballast was then carried in race two by the top five finishers from race one and in race three by the top five finishers from race two respectively.
• 'Negative' ballast for finishing outside the top five in races was abolished
• Tyres were limited to 16 new slicks per race weekend, but with no limit on wet-weather tyres
• All teams were permitted only up to four days' testing during the season
• Teams were permitted to build their own Super 2000 specification cars and enter them for the championship even if they did not have proper FIA homologation. Provided they met all current S2000 requirements the BTCC was able to grant the cars 'local homologation'.

Drivers Championship

(key)

Pos	Driver	DON			THR			BHI			OUL			CRO			MON			SNE			KNO			SIL			BHGP			Pts
1	Matt Neal	1*	3	1*	3	2	4	1*	1*	6	2	1*	2	3	6	2	3	3	7	3	3	4	2	1*	2	9	4	7	4	3	5	316
2	Yvan Muller	2*	1*	3	6	3	3	3	4	1*	4	2	Ret	2	1*	8	1*	6	1*	4	4	3	1*	2*	Ret	4	Ret	5	2	11	Ret	273
3	Dan Eaves	3	4	2	1*	1*	1*	Ret	3	2	3	3	6	5	10	1*	6	2	4	2	2	5	4	Ret	6	Ret	3	4	1*	2*	Ret	269
4	Jason Plato	6	5	6*	2*	5	5*	4	2	3	1*	10*	3	4	13	3	2	10	Ret	Ret	10	1*	6	8	5	3	DSQ	6	3	1*	Ret	208
5	Tom Chilton				10*	6	Ret	7	NC	7	5	5	1*	6	3	9	9	8*	2*	1*	1*	7	5	3	3	1*	8*	3				175
6	Colin Turkington	5	Ret	8	4	7	2	2	5	5	10	6	Ret	1*	2	7	4	1*	5	7	7	Ret	3	4	7	7	Ret	9	7	Ret	6	174
7	Rob Collard	4	2	4	5	11	Ret	6	6	Ret	8	4	4*	7	4	5	5	4	3	5	5	12	9	9	1*	10	10	2*	Ret	9	1*	173
8	James Pickford	9	7	7	7	4	6	9	8	DSQ	9	7	7	10	8	4	11	9	Ret	6	9	2	Ret	12	Ret	2	6	8	9	5	2	116
9	Luke Hines	7	8	9	8	8	8*	5	Ret	Ret	7	Ret	5	Ret	9	6	12	5	Ret	10	8	Ret	7	5	Ret	6	1*	Ret	Ret	7	Ret	87
10	Gavin Smith	8	6	5	9	10	Ret	10	7	Ret	6	11	Ret	8	7	Ret	7	Ret	6	9	11	8	8	Ret	Ret	11	2	11	6	4	3	86
11	James Kaye	Ret	Ret	Ret	Ret	9	7	8	Ret	4	11	DNS	Ret	9	5	Ret	8	Ret	11	8	6	6	10	Ret	Ret	8	Ret	10	8	6	7	58
12	Gareth Howell																						Ret*	6	4	5	Ret*	1*	5	DSQ	4	54
13	Jason Hughes																10	7	8				11	7	8				10	8	8	22
14	Richard Williams	NC	9	11	DNS	DNS	DNS	Ret	DNS	9	13	9	Ret	13	12	Ret	15	12	13	13	12	9	DNS	Ret	DNS	12	7	Ret	11	Ret	9	14
15	Mark Proctor	10	Ret	10				Ret	DNS	8	12	8	Ret	Ret	DNS	DNS	14	Ret	10	12	Ret	11	13	10	10	Ret	9	12	NC	Ret	13	13
16	Fiona Leggate													11	14	10	13	13	9	11	13	DNS	14	11	9	13	5	13	13	Ret	10	12
17	Ian Curley							NC	9	NC	DNS	DNS	DNS	12	11	Ret	16	11	12	14	Ret	10	12	Ret	DNS	14	11	14	14	12	12	3
18	Andy Neate																												12	10	11	1
Pos	Driver	DON			THR			BHI			OUL			CRO			MON			SNE			KNO			SIL			BHGP			Pts

• Note: bold signifies pole position (1 point given in first race only, and race 2 and 3 poles are based on race results), italics signifies fastest lap (1 point given all races) and * signifies at least one lap in the lead (1 point given all races).

Manufacturers Championship

Teams Championship

Independents Trophy

Pos	Driver	DON			THR			BHI			OUL			CRO			MON			SNE			KNO			SIL			BHGP			Pts
1	Matt Neal	1	3	1	3	2	4	1	1	6	2	1	2	3	6	2	3	3	7	3	3	4	2	1	2	9	4	7	4	3	5	367
2	Dan Eaves	3	4	2	1	1	1	Ret	3	2	3	3	6	5	10	1	6	2	4	2	2	5	4	Ret	6	Ret	3	4	1	2	Ret	313
3	Rob Collard	4	2	4	5	11	Ret	6	6	Ret	8	4	4	7	4	5	5	4	3	5	5	12	9	9	1	10	10	2	Ret	9	1	256
4	Tom Chilton				10	6	Ret	7	NC	7	5	5	1	6	3	9	9	8	2	1	1	7	5	3	3	1	8	3				230
5	James Kaye	Ret	Ret	Ret	Ret	9	7	8	Ret	4	11	DNS	Ret	9	5	Ret	8	Ret	11	8	6	6	10	Ret	Ret	8	Ret	10	8	6	7	140
6	Richard Williams	NC	9	11	DNS	DNS	DNS	Ret	DNS	9	13	9	Ret	13	12	Ret	15	12	13	13	12	9	DNS	Ret	DNS	12	7	Ret	11	Ret	9	79
7	Mark Proctor	10	Ret	10				Ret	DNS	8	12	8	Ret	Ret	DNS	DNS	14	Ret	10	12	Ret	11	13	10	10	Ret	9	12	NC	Ret	13	70
8	Fiona Leggate													11	14	10	13	13	9	11	13	DNS	14	11	9	13	5	13	13	Ret	10	69
9	Gareth Howell																						Ret	6	4	5	Ret	1	5	DSQ	4	67
10	Jason Hughes																10	7	8				11	7	8				10	8	8	57
11	Ian Curley							NC	9	NC	DNS	DNS	DNS	12	11	Ret	16	11	12	14	Ret	10	12	Ret	DNS	14	11	14	14	12	12	52
12	Andy Neate																												12	10	11	12
Pos	Driver	DON			THR			BHI			OUL			CRO			MON			SNE			KNO			SIL			BHGP			Pts

Independent Teams Championship