These fabulous old advertising posters were recently discovered during rennovation works at Notting Hill Gate underground station. The posters were uncovered in an old lift passageway, and date from c. 1956-1959, when the station's lifts were removed and replaced by escalators.
London Underground will be leaving the posters intact, but they are unfortunately inaccessible to the public. However you can view lots more photographs of this treasure trove of design history on Flickr here.
[all images via London Underground]