You have my sympathy.
I am not a professional driver but I drive on the A12, M11 and M25 fairly regularly. Not often I see an empty lane 3! ISTR years ago coaches were allowed to use lane 3. Never ceases to amaze me how well a lot of drivers pull back in on parts of the continent. The M25 used to be much easier on a foul dark winter's night because the idiots stayed off the road. The A414 between Chelmsford and Harlow is a pain because of the horseboxes and others doing 40mph with limited overtaking opportunities (even with a 2 litre 2 seater). You would think with an enormous snake behind them they might take the hint and pull over occasionally.