An interesting original 1940 dated Souvenir Programme the children & users of the Bon Marche Air Raid shelter Christmas 1940, a small amount of research shows the following info
Regent Street, 94
September 1939-May 1942. Business-hours public shelter from 1940-1942 when it was withdrawn. File consists of correspondence, memos. Premises started to be used as a late night club, hence no longer was usable as a daytime shelter.
This was found at the following link
The programme is in good condition with dirt and marks to it.