In England, the game plan is that you should stay in the left (bearing in mind that we drive on the other side) lane as much as possible. You're only supposed to move to the next lane should you wish to overtake someone. There (technically) is no slow lane, no fast lane. The point is: you overtake by moving into the next lane.
The only reason for staying in anything other than the left-hand lane is that everyone else is going slower than you. And nobody should be going faster than 70mph anyway *cough*.
Roger - not necessarily speaking for empeg
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roger