Question Topic: Band 1 road procedure
Explanation: You should stay in the left-hand lane of a motorway unless overtaking. The right-hand lane of a motorway is an overtaking lane and not a 'fast lane'. After overtaking, move back to the left when it's safe to do so.
Category: Band 1 road procedure
References: The Official DVSA Guide to Driving: Section 11, Highway Code: Rule 264