Greydog and X5SMW, Thank you for your replies. It is beginning to look like we may have no choice other than rejecting it. The selling garage want the car taken to a garage that does RAC warranty work, and I emailed them last night stating I was looking into rejecting the car and before they allowed any work to be undertaken I needed a costed, fully itemised list of anything to be done along with details of any warranty/warranties that come with the work. Nothing was declared in the finance agreement, and to be fair to the selling garage I think they bought it not knowing about the fault but that is their problem, not ours.
Thanks for your advice and I'll update once we know more.