Well and the end of the day, youve bought it through a VW dealer and they would of given you 1 years full return warranty if you were to have any other faults.I have to say, if you buy ANY kind of second hand motor from ANY dealer whether its VW or not, you WILL always have niggly things happening, even new GTi owners have been back to dealerships to sort out dashboard squeeks and rattles and is pretty comon place with most Car makes Now days. Have to say if had several cars from different manufactures over the years and VW are by far the way the Best in resolving issues and show interest in after sales rather then the attitude of "got his money now do one"as in others like Seat, peugoet,citroen as ive in the past. If the car does have lots of problems, you are within your rights to return it for full money back , but i still would consider another GTi because it is such a great Car and a dealer could sort a replacement from any of the dealers from the uk or their Vw national stock list.
Some pics would be good if u can upload derdle