I wish i had acted sooner!! and had the car towed!!
After a long wait the police spoke to the owner of the car and has flatly denied any involvement of damaging my door! He told us both that his friend came over on holiday and used it a couple times but has also denied any wrong doing...
I'm pretty sure he is a lieing jackass, as he said that there is no damage to his car door, even though i got a picture and there is blue marks left on my car -Next step now, I'm going to get the police to see if they can do the forensics on the paint left on my door and see if it matches his paint...
All still very shady at the moment.. keep your fingers crossed
last note...I'll be getting a crime ref. no. as its criminal damage - need to check if i'll lose no claims, will call and find out tomorrow