Tale of an ENSA ("Every Night Something Awful") troupe inflicted on an unwilling British Army officer.
Fairly amusing, and Marks is at his angriest, but needed a Ralph Thomas or similar as director to really make the material shine. Sort of turns into the light entertainment version of Ice Cold in Alex towards the third act, which is the most interesting bit.
Note: Apologies for poor caps, cannot obtain DVD at this time; consider these placeholders.