The Race Centre Hotlap Chart
They have 2 venues now, one in Surbiton (London) and another in Southampton. It sounds like there will be another venue open by the end of the year. If anything it's a good laugh with your buddies! They cater on site and can order food in, with a bar available! The Surbiton site has the good equipement, with the graphics like what you can see on your home PC. Even Sam Bird had a go (check hotlap chart, class D for December!) I saw him at the venue opening in Surbiton, man is he short!
For the hardcore racers out there (cmon Jack I know you wanna have a go!) they run a monthly Championship series. When they get a good following at the London site they will start running linked races so there are full size grids. I had a chance to race some of their regulars, they are pretty good.