When up north I always let the psycho country bumpkins past on single track roads, they go flying round blind bends at 60mph, wether you know the road or not you don't know what's coming round the corner.
Would I f**k be pulling over whilst doing the speed limit on a normal road to let some raging gammon past.
Dual carriageways and motorways only in the outside lane overtaking and even if I am going faster than the lane next to me if I see someone racing up behind me I'll let them past when safe.