Great picture of the TriStar LTN man!
So does my memory serve me right - the current TOM hangar site was at that time used by Court Line, with some funny docking doors for the TriStar tail.
So were Britannia totally in Hangar 89 ( hope I've got that right!) then.
So at some stage BY/TOM must have re-taken possession of that far side hangar. And my TOM friends tell it has been re-built on the same site.
And is/was it a Corporation hangar available for lease or something else
I'm sure you know - if not Buster or Vintage ATCO.