Brighton for sure, theres some great city roads around here that would be great in Gran Turismo. Il try talk through a potential lap:
Start line, Brighton pier on the seafront, heading west on the seafront, around 0.2 miles before a 90 degree right hander onto a wide 2 lane uphill blast across a junction past the clock tower (levels slightly, little jump to unsettle the cars) for about 0.3/4 miles, the a very fast but quite tight 45 degree right hander across the road and onto a narrow downhill, goes from 2 lanes to 1 down a tight street, 0.2 miles, 90 degree left at the bottom onto a 3 lane section wchi loops arond the old steine park back towards the coast (0.5 miles), taking a long left hander up a big hill 2 lanes wide with the Amex bulding on the left, road narrow down to a normal 2 way street and goes horribly off camber for 0.7 miles before a tight left hand 90 degree bend and onto a mini roundabout goign right on the 3rd exit and up a short hill (0.2 miles). Right at the top off the hill and dropping downa slip road towards the marina, fast 2 lane right hander going down which sweeps into a left hander under a tunnel before flying across 2 of the lanes and flying up the exit eoad back onto the coast road for 0.1 miles, the a shapr left right chicane onto a sliproad down to the promenade (where the famous brighton speed trials are held) flat out for 0.8 miles couple of nasty bumps and 2 bollard chicanes and back to the Brighton Pier.