UK driving theory test by DVLA/DSA requires you to learn about highway code and understand the reasoning behind rules and regulations as well as recommendations. The theory test as of 2013 consists of multiple choice questions that are designed to test your knowledge and understanding of the topics covered under driving theory test. The driving theory test revision / practice system designed here at includes official theory test revision material that can be used for practicing and testing your knowledge. After each question, the new learner drivers are explained in detail the knowledge and understanding behind each question.

I have changed the home page a bit. The theory test practice is in same location like always.
Here is a quick link to it

Click here for UK Driving Licence Theory Test Practice