How long has he had the car for?? as for claiming it back if it is found to be stolen then you cant just claim it back it will go to the crusher or you MAY! be able to BUY! it back from the insurance company but they wont just give it back why dont he just try and get a new log book the previous owner probley aint bothered he's got his money for the car so he aint going to be in any rush to help your mate out. Id try and get a log book and see what DVLA say when you apply for one here's the link
http://www.direct.gov.uk/Motoring/Bu...404&chk=icYOWC