i was VERY lucky, managed to get a Red BA GT with black stripes for 2 hrs, I left my car at the DP's house, he handed over the keys with strict instructions to have it back 2hrs later!
So naturally I enjoyed myself whilst sh!tting myself for those 2 hours, but it was awesome.
Course, that only happened cos we're close family friends of the DP.
Best thing I can suggest is approaching the local dealers, majority of them will see it as a good chance to advertise, and they will provide a driver (no way you'll get the keys!), you will most likely have to pay for it, but hey - whats a tank of fuel when you're turning up in a GT?!