Video: 40 years since the start of the Humber Bridge

At the time it was opened in 1981 the Humber Bridge was the longest single span suspension bridge in the world.

It may not be able to lay claim to that title these days, but it's still a breathtaking feat of engineering. There've been rows over tolls and its cost ever since it was constructed - but how many can remember the building work which actually started 40 years ago this month.