Derelict London tube stations are one of the many things I'm interested in. As well as the websites, there are several great books on the subject (with some excellent pics) by J.E. Connor.
Abandoned Aldwych station and the derelict section of tubeline that runs from it to Holborn are both often used for filming.
If you get on a tube train heading west from Holborn to Tottenham Court Road station, and you look out of the right-hand side of the train (north side) just after you leave Holborn, you'll see the grimy white tiling of the derelict British Museum station, closed since the 1930s.