I haven't been in many well-known cars but I am lucky enough to have had a ride in both of Mr Rainbird's Cosworths, both at Donington track.....and also the Sapphire up to Alconbury.
Mike's old Sapphire was the first BIG power one I'd been in - it was about January or February I recall and was a Scoobynet track day we'd gatecrashed. The best memory of it was
a/ taking on the Diablo down the pit straight and out-accelerating him.....and yes, he DID try

b/ coming out the Old Hairpin with a gaggle of eager Subarus snapping at the rear bumper........and then watching them disappear backwards like they'd run into treacle as the back end of Mike's car slowly arced round in a drift as he put the power down......and then just hooked up and powered up the hill
Also met Jim Green there that day.......
And was sat in CossieKiller Stef's car when he crashed it at Cranar

...so quite a memorable day
Also went in Peggy around Donington - very fast......but somehow preferred the Sapphire.
Jay B also took me for a few laps round Combe, really nice Escort Cosworth, he was going well as we were getting held up by Steve Riches R33 GTR
Cheers