This is a great site for learners with a great mock test that changes daily

The Highway Code should be the drivers bible. 

The online version is great for checking anything up

The driving standards agency, 

The place to book and manage your theory and practical driving tests online.

UK Motoring Directory - home to information on various aspects of driving.

John Farlam's Smartdriving website. 

A fantastic site with loads of information for everyone: learners, soon to become learners, instructors and trainee instructors

Knockhill Racetrack - the home of Scottish Motorsport