The various changes of the RAF Manston Control Tower
1950's when USAF were based there.
1970's under RAF management as I remember the old place.
1980's still under RAF management ... with a few additions and deletions.
2000 as Kent International Airport ... with tasteful cladding and presumably "elf n safety" required the additional fire escape to be installed
Shame they can't afford a lawn mower and strimmer
Coff.