London’s Albert Bridge – a very pretty and illuminated part-suspension bridge – crosses the Thames between Chelsea and Battersea. It often appears in films and TV ads (Cheryl Cole’s new hairspray is the latest).

A few years ago, it was closed to traffic for over a year for repairs. Kensington and Chelsea council blamed ‘Chelsea tractors’ for damaging the fragile structure, which had a two tonne weight limit. 

That turned out to be a load of spin: the damage was mostly being caused by London’s Black Cab fleet, which easily weigh over two tonnes with a couple of passengers on board.

After the re-vamp, the bridge’s weight limit was upped to three tonnes. With Black Cabs now less of a threat, the real problem for the bridge would clearly have been commercial vehicles, such as super-sized vans and lorries.