The historic RAF Uxbridge bunker has been forced to scale back its opening hours this summer.
Although Monday-Friday opening is unaffected, it will now only open for pre-arranged tours at weekends from 10-3pm this weekend  then the weekends of June 5-6, August 2-3 and the Battle Of Britain Heritage Weekend of September 13-14.
Staffing issues are being resolved and volunteers recruited.
Bookings for all visits can be made by calling 01895 238154. There is no charge for admission but a donation of £3 per head is suggested.
The Grade 1 listed building is the bunker from which most of the Battle of Britain was controlled, as well as the air cover for the Dunkirk evacuation and the D-Day landings.