There is definitely no GT 3.2 limited edition, the only limted editions come in 1.9 form with the blackline, cloverleaf and Q2 and the blackline also had a 2.0 JTS and a 1.8 TS, there is also the petrols in the Cloverleaf. There was also one in white that was just called a special edition I think? Diesel only.
I would say £5k is a little cheap with that mileage, although the spoilers would knock a few hundred quid off lol. Mine is still for sale-ish. I say ish as a work colleague wants it but he hasn't sorted his finance yet. I have not checked if mine is still showing in the classifieds here? Mine is up for £5395 with 73k miles but it has just had its service, MOT and 6 months tax put on, along with a cat back sports exhaust and front sports cat in the last year. It sounds absolutely epic!