The UK government provide a guide for car drivers which contains information about learning to drive your car in Britain, driving licenses, road safety driving programmes, buying, selling and owning a car and changing your name and address.

http://www.direct.gov.uk/Topics/Motoring/fs/en

Driving in Britain as a visitor or a new resident

Visitors to Britain may drive vehicles up to 3.5 tonnes and with up to 8 passenger seats, provided you have a full licence or driving permit .This remains valid for up to 12 months from the date of entering the United Kingdom.

For more information visit:

http://www.dvla.gov.uk/drivers/drvingb.htm