If you are a learner driver you must take and pass your theory test before you book your practical test. If you already have a driving licence you might not have to take another theory test if you want to start driving a different vehicle.

Full details about the theory test can also be found on the DirectGov website.

Booking a Theory Test

You can book a theory test here.

Mock Theory Test

There are lot's of online resources where you can take a mock theory test, the best of which being here.