Mathepac, thanks for the link.
I am planning to email the dealer today and request a gaurantee. The car is less spec than my own own but the money to change is bang on my budget. I was just at the stage of filling in the paperwork when this question came up and we decided to leave and think about it as there was no movement from the salesman at all.
I cant see a problem from the garage point of view, the car is just a year old last month so nothing should go wrong really.
Any other comments appreciated.