go to the police with his number / name / car details etc - he has just stolen your cash from what i can tell and from what i have read from the guy who is trying to contact him with coilpacks.
if you looked into his SAU account info you would see its linked to http://nissjets.webs.com/ which has his name as 'Peter Walker'
has same stagea pics on his profile.
http://nissjets.webs.com/apps/profile/50365902/