Work at the station has recently uncovered these amazing advertising posters in non-public areas and that date from c1956 - 1959 when the station's lifts were removed and replaced by escalators. These are in an old lift passageway.
This great image is to advertise the opening of the then new Iron & Steel Gallery at London's Science Museum. The powerful image, sadly not 'signed', shows a transfer ladle during a 'pour' - one of the great visuals of the age of iron & steel.
We will be leaving these intact - and please do not pester the station staff as the posters are wholly inaccessible - which is why they've probably survived 50 odd years!
The photos were taken officially - please do credit London Underground in any links.