Checks when buying a used car
https://www.gov.uk/checks-when-buying-a-used-car
Get vehicle information from DVLA
https://www.gov.uk/get-vehicle-information-from-dvla
Q&A: Buying a used car
http://news.bbc.co.uk/1/hi/business/8574668.stm
Car Data Check in UK
http://www.cardatachecks.co.uk/
https://www.hpicheck.com/
Everything you need to buy a used car
http://www.autotrader.co.uk/advice/2010/09/buying/buying-a-used-car