Came across this story on Twitter:
"In the late 1950s, the Notting Hill tube station underwent a major
overhaul when the old lifts that transported passengers to and from the
train platforms were abandoned and replaced with modern escalators. The
passageways to the lifts were sealed off too and everything within them was
subsequently frozen in time.

In 2010, some new routine works were underway when the sealed-off
passageways were re-discovered after 50 years, revealing a mini museum of
well-preserved vintage posters from the post-war era."

From:
http://www.messynessychic.com/2013/0...l-underground/