This is a peculiarly british habit and needs to be actively discouraged by a pass either side law as practised in USA for years
Soddim,
We're allowed to overtake on either side, but it doesn't stop the right lane hogs
They just match speed to a kindred soul (or truck) in the left lane, and count how many they can bank up behind them
Our State (Victoria) is obsessed with speed as a root cause of accidents, and are quite feral in their fund raising: 40kph school area limits, variable freeway limits, cameras (fixed and mobile), time/distance travelled cameras, etc etc. Budget allocation for speeding fine income, $A400million per year, from a population of 5 million
My 285Kw's just seem to get me down the freeway onramp quicker, to join the lemmings at 10kph below the posted limit. Sad, really