Quote from the Highway Code

"You should drive in the left-hand lane if the road ahead is clear. If you are overtaking a number of slower moving vehicles it may be safer to remain in the centre or outer lanes until the manoeuvre is completed rather than continually changing lanes. Return to the left-hand lane once you have overtaken all the vehicles or if you are delaying traffic behind you."

My pet hate is the lane hopper who believes that you must change lanes at every opportunity even if you will need to pull out again in two seconds.

Stu