For most of us an F1 car may as well be a spaceship for all the chance we'll get to drive one... But not so GTs. Grand Tourers are based on production cars. Cars we could all drive on track days across the UK. Cars occasionally glimpsed, or heard on the road.

History - The Avon Tyres British Championship was originally established in 1993 but was taken over by SRO - who look after its organisation and promotion - in 2004.

British GT comprises two classes running in the same race: GT3 and GT4.

GT3 has been part of the series since 2005 but assumed premier class status in 2007.

Regulations - GT3s must be based on road cars in mass production, and performance enhancements are regulated to prevent a single manufacturer from becoming dominant.

GT4s are the closest to a road car to be found in motor racing, 90% of each car is what you would find on the same vehicle you would see on the road.

All cars in both classes are homologated, which means their performance is near identical. This ensures that the series remains about driver skill, rather than money spent on updates.

Indeed, overt manufacturer support is prohibited, helping to keep costs relatively low and avoid an arms race.

Cars - GT3 cars carry over some styling cues and components from their production counterparts, but are 500-600bhp race-bred machines. Essentially, it’s a recognisable but ultra-aggressive version of the road car. They are easily identifiable on the grid by their large wings and high spoilers. In short, they look more muscular.

Examples of GT3 cars competing in British GT include the Aston Martin V12 Vantage, Ferrari 458 Italia, Mercedes SLS AMG, McLaren 650S, BMW Z4 and Ginetta GT3.

Aston Martin GT Vantage

GT4 features similar cars, albeit with less power and fewer race-bred components. They also look more similar to their production cousins than GT3s. Indeed, they are required to be 90% of what would be seen on the forecourt.

The Aston Martin V8 Vantage, Ginetta G55, Lotus Evora, Porsche 911 and Toyota GT86 comprise the GT4 machinery currently competing in British GT.

This class is intended as a stepping stone for young professionals and amateur drivers into GT racing and then up into GT3.

Toyota GT86

Races - GT and sportscar racing is traditionally seen in terms of endurance rather than sprint racing, and that’s the case in British GT.

Some weekends will feature two one-hour races, while others comprise a single two- or three-hour race.

As a result, and as is common in endurance racing, two drivers ‘share’ one car. Only one is in the car at any one time, but they do swap halfway through the race.

Drivers - British GT typically operates on a Pro/Am basis. In a literal sense this means one is a professional and the other an amateur (or gentleman, as they're also known).

This ensures against all-pro line-ups coming in and dominating against those who aren’t first and foremost racing drivers. Indeed, there are a lot of successful businessman competing who are also very fast drivers but not considered Pros.

All these elements come together to form an exciting series in which anything can happen as Pros and Ams alike battle to make it to the end of the race, let alone the podium.

So get the edge of your seat warmed up and follow the action on All 4.

For more information about the series, including detailed standings and driver biographies, visit: British GT

Highlights from Silverstone available on All 4 until 5th July.

Silverstone, Northamptonshire

Circuit Length - 3.660m/5.891km