You are travelling on the motorway. You have cruise control set to 70. You are in lane A and have been for miles. You are approaching some imbecile in lane B or C travelling at less than 70. Whats the correct legal procedure?
Obviously if lane C is free you can go around them that way!
Highwaycode says if you're following the flow of the traffic you can undertake but not sure about how that is perceived.

