Useful Links:

Book Your Theory test:

http://theorytest.direct.gov.uk/dsa/book

Book your practical test:

http://www.direct.gov.uk/bookpracticaltest

Try the DSA practice Theory test:

http://www.theory-tests.co.uk/index.asp

The Highway Code:

http://www.direct.gov.uk/en/TravelAndTransport/Highwaycode/index.htm