Just thought I would mention the Original Poster asked the question on the 20th June and replied twice on that date. They have not been seen on this website since.
This thread may have some generic use for buying advice but I would not bother addressing the OP any more.
By now I imagine they bought the car from their friend for the £5,000, realised it was a rip off and fell out. Then the car broke down on the M1 in a rain storm on the way to taking his brother to an important medical appointment. The OP then demanded money back from the 'friend' but they had already spent the money on a holiday, so they had to go to a Pay Day Lender. Having failed to make payments to the Lender, the friend was eventually made bankrupt and became homeless. The car buyer also lost out massively on the repairs and ended up borrowing money from their Dad, who, finding himself unable to find the cash for his son and also for life saving surgery for his other child, shot himself. Unfortunately, the wound was not fatal and so the original poster then found themselves with no car, no money, Dad in a coma, brother needing life saving surgery and friend bankrupt and homeless.
The moral - never buy a car from a friend.