Here is a list of useful links for all learners:

Learning to drive
Information for learner drivers and riders, and newly qualified drivers and riders.
http://direct.gov.uk/drivingtest

Booking and managing a theory test
Driving Standards Agency Online Booking for Theory Tests for Car, Motorcycle, Bus, Lorry, ADI, RLGV.
http://direct.gov.uk/booktheorytest | http://direct.gov.uk/changetheorytest

Booking and managing a theory test
Driving Standards Agency Online Booking for Practical Tests for Car, Motorcycle, Bus, Lorry, ADI, RLGV.
http://direct.gov.uk/bookpracticaltest | http://direct.gov.uk/changepracticaltest

Find your nearest
This includes your nearest theory and practical test centres, and test routes.
http://direct.gov.uk/motoringnearest

The Highway Code
Official document of the United Kingdom. Includes illustrations and usage of signs and signals.
http://www.direct.gov.uk/en/TravelAndTransport/Highwaycode/index.htm

Pass Plus Website
Pass Plus is a training course specifically aimed at new drivers, designed by the Driving Standards Agency (DSA) with the help of insurers and the driving instruction industry.
http://www.passplus.org.uk

Pass Plus Insurers
When you successfully complete PASS PLUS you will usually qualify for a substantial discount on your motor insurance policy.
http://www.passplus.org.uk/insurers.asp