Early years

The championship was initially run with a mix of classes, divided according to engine capacity, racing simultaneously. This often meant that a driver who chose the right class could win the overall championship without any chance of overall race wins, thereby devaluing the title for the spectators – for example, in the 1980s Chris Hodgetts won two overall titles in a small Toyota Corolla prepared by Hughes Of Beaconsfield, at that time a Mercedes-Benz/Toyota main dealer when most of the race wins were going to much larger cars; and while the Ford Sierra Cosworth RS500s were dominating at the front of the field, Frank Sytner took a title in a Class B BMW M3 and John Cleland's first title was won in a small Class C Vauxhall Astra.

Modern era

Teams

BTCC teams are a mixture of manufacturer entries (currently BMW and Toyota) and independent teams such as BTC Racing, and Motorbase Performance.

In 2010, following Vauxhall's decision to pull out of the series, there were two new works teams, : Chevrolet, run by RML; and Honda, run by Team Dynamics.^[5]

In 2005, Team Dynamics became the first independent outfit to win the BTCC drivers and team championships; Matt Neal won the overall and independent drivers contests in his Team Dynamics Honda Integra. This included finishing all 30 championship races that year, something no other driver had achieved before and only equalled by Adam Morgan some 10 years later in 2015. This ended Vauxhall's run of 4 victories in the drivers and teams championships between 2001 and 2004. Neal and Dynamics were also victorious in 2006, before Vauxhall won the 2007 title with Italian Fabrizio Giovanardi. Team Dynamics also achieved the first overall independents race win in the 'Supertouring' era when Neal won a round of the 1999 BTCC at Donington Park, earning the team prize-money of £250,000.

As a result of Matt Neal's championship victories, and the fact that Team Dynamics were designing and building their own S2000 Honda Civic Type R (with unofficial support from Honda), they were no longer entered into the Independents category, and were classed as neither an "independent" or "works" team until the 2009 season, when the Manufacturers championship was renamed Manufacturers/Constructors Championship to allow both Team Aon and Team Dynamics to compete with at the time the sole works entry of Vauxhall.

Current regulations

As of the 2014 British Touring Car Championship, all cars are built to the same regulations:

• Next Generation Touring Car. New set of regulations specifically developed for the BTCC as a way of moving the sport forward and cut costs for competitors. Introduced from 2011, these new technical regulations were designed to dramatically reduce the design, build and running costs of the cars and engines as well as reduce reliance on WTCC/S2000 equipment. NGTC cars initially maintained performance parity with S2000 cars until the 2013 season when full NGTC cars became the main championship class with Hybrid S2000/NGTC cars running in a secondary class. From the 2014 season, only NGTC cars are eligible to compete in the BTCC.

Cost control measures

There are strict limits to the modifications which can be made to the cars, which are intended to reduce the cost of running a competitive team, which had become prohibitive in the final years of the Super Touring rules. These cost reductions saw a rise in independent entries – teams or individuals entering cars purchased from the manufacturer teams when they update their chassis.

With the introduction of the NGTC rules, all cars share a number of common components provided through a contract with RML Group. This has allowed many independent teams to enter without the need for manufacturer support, and negating the need to source ex-works cars. Teams can install an engine from their marque's broad 'family' of cars, or opt to lease an engine from TOCA, built by Swindon Engines which also helps to make the cost of entry more affordable.

To further keep costs in check, the BTCC uses a single tyre supplier, with Goodyear Tire and Rubber Company the current supplier of rubber to all the teams. The following compounds are used: Hard, Medium, Soft and Wet.

Fuels

The rules previously allowed for a variety of different fuels in a bid to encourage more efficient cars. In 2004 Mardi Gras Motorsport independently entered a Liquified petroleum gas powered Super 2000 Honda Civic Type-R (which was subsequently replaced by a more competitive BTC-Touring Peugeot 406 Coupé, still LPG powered), and in 2005 Tech-Speed Motorsport converted an ex-works Vauxhall Astra Coupé to run on bio-ethanol fuel. In the middle of 2006, Kartworld's owner-driver Jason Hughes converted his 4-cylinder MG ZS to run on Bio-Ethanol, soon followed by the West Surrey Racing cars of championship contender Colin Turkington and Rob Collard, and for the final event at Silverstone, Richard Marsh converted his Peugeot 307 to run on bio-ethanol fuel. Only Hughes continued on this fuel in 2007 and 2008. The regulations also permitted cars to run on diesel; attempted first in the 2007 season by Rick Kerry in a BMW 120d E87 run by Team AFM Racing. In 2008 SEAT Sport UK entered two Turbo Diesel Power SEAT Leons – the first diesel powered manufacturer entered cars. At the start of the 2010 season, it was announced that Team AON racing had converted both of their Ford Focus ST cars to run on LPG.

Under current NGTC regulations, all entrants use Carless HiperFlo 300 which is a 101/102 RON and 89/90 MON unleaded gasoline with approximately 2% oxygen content that meets the FIA 'Appendix J' gasoline specification.

Previous regulations

The following regulations have been applied to the championship:

• 1958 – unique BTCC regulations^[1]
• 1959 – FIA Appendix J Category C^[1]
• 1960 – 'silhouette' special saloon cars (1000cc)^[1]
• 1961 to 1965 – FIA Group 2^[1]
• 1966 to 1969 – FIA Group 5^[1]
• 1970 to 1973 – FIA Group 2^[1]
• 1974 to 1983 – FIA Group 1^[1]
• 1983 to 1990 – FIA Group A^[1]
• 1991 to 2000 – 2 Litre Touring Car Formula, later becoming FIA Super Touring
• 2001 to 2011 – BTC Touring. The BTCC developed and introduced this specification in 2001, in response to the spiralling costs of the Super Touring specification. However, with the Super 2000 specification being used in the newly reformed World Touring Car Championship, the popularity of the BTC-T spec with top teams and manufactures was short lived. Therefore, from the 2007 season, BTC-T spec cars were no longer allowed to win the championship outright. The 2010 season was meant to be the last year BTC-T cars would be eligible to enter the championship, however Series Director Alan Gow announced a one-year extension to allow BTC-T to compete in 2011 (with their base-weight +50 kg on the 2010 season). Only cars that competed in 2010 would be eligible to race in 2011.^[6]
• 2004 to 2013 – Super 2000. Regulations first introduced to the BTCC in 2004, allowing teams to build cars eligible to race in several different Touring Car Championships, including the World Touring Car Championship. Car built to this specification were eligible to compete until the end of the 2013 season, however the last fully S2000 cars were entered in the 2011 season.
• 2010 to 2013 – S2000/NGTC Hybrid. From the 2010 season, teams with S2000 chassis were allowed to use an NGTC engine with their car. As of the 2012 season, all teams with S2000 chassis, used NGTC turbo charged engines. This hybrid specification was eligible until the end of the 2013 season.

Current points system

Points are awarded to the top fifteen drivers in each race as follows:

• No driver may collect more than one "Lead a Lap" point per race no matter how many laps they lead.

Previous points system

Points are awarded to the top ten drivers in each race as follows:

• No driver may collect more than one "Lead a Lap" point per race no matter how many laps they lead.

TOCA support package

The TOCA Support Package consists of five main support championships, which support the championship at almost every round, along with several smaller championships supporting one or two events. All the support championships are either Single Make Championships or Formula racing.

After previously supported the BTCC in the late 1990s and then in 2013 and 2014, the British Formula Ford Championship announced that it was folding to become the MSA Formula, the FIA's Formula 4 championship in the UK for the 2015 season. Known as F4 British Championship from 2016, the championship uses Mygale carbon-fibre monocoque chassis and a Ford 1.6L EcoBoost engine as used in the more modern Formula Ford cars.^[24]

The Ginetta GT Supercup is a GT style, multi class championship. The main class is the G55 class, utilising Ginetta's G55 car. The second class, known as the G50 class, utilises the older and less powerful Ginetta G50. Most weekends in 2013 see three Supercup races with a few rounds hosting only two races. Ginetta also run a championship on the support package that caters for up and coming young talent in the form of the Ginetta Junior Championship. These 14- to 17-year-olds race in identical Ginetta G40J cars with strict regulations which help keep costs down. In 2013, the championship with run two races at all BTCC weekends.

Out of all the current support series, the Porsche Carrera Cup GB is the longest serving support championship. Drivers compete in identical Porsche 911 GT3 Cup (Type 997) cars which produce 450 bhp. The three tier championship splits drivers according to their racing experience. Professional drivers compete in the Pro class, with semi-professional and amateur drivers racing in either Pro-Am1 or Pro-Am2. From 2013, the Carrera Cup has held two races at each BTCC meeting.

Finally, the Renault Clio Cup UK allows aspiring touring car drivers to showcase their talent in this single make series, utilising Clio Renaultsport 200 cars. The championship awards three different titles for drivers. Along with the overall drivers' championship, younger rookie drivers can chase points for the Graduate Cup and older gentlemen drivers can seek points for the Masters Cup. During 2013, the Clio Cup will hold two races at all BTCC weekends except the rounds at Croft and Knockhill.

For 2020, the Renault Clio Cup UK has been replaced by the Mini Challenge, which joins from the British GT package. The Clio Cup has joined the British GT Package instead.

Previous support races

This list is incomplete; you can help by adding missing items. (February 2011)

• Formula Renault UK - Early in 2012, the long supporting Formula Renault UK championship announced that it had cancelled its 2012 season after only receiving six entries and hoped to return for the 2013 season.^[25] However, it was reported in the media that the series was ended definitively in September 2012.^[26]
• SEAT Cupra Championship - was a one make series that ran for six years between 2003 and 2008, and as a support package to the BTCC between 2004 and 2008. The series folded after SEAT UK ended its racing activities.
• Formula BMW UK
• Renault Spider Cup
• Formula Vauxhall
• Formula Vauxhall Junior
• Lotus Elise Championship
• Vauxhall Vectra Championship
• Ford Fiesta Championship