The perceived '15C/33C' runway was the 1945 'RAF Heathrow' NW/SE runway, very possibly then aligned 16/34 magnetic. It had to be built to keep up the pretence that the airfield was 'needed' by the RAF. Construction of this runway was abandoned in 1946 and was subsequently all but obliterated by the Central Area development, control tower included. I believe that it was the northern part of this runway known as 'Waites Alley' where the Viscount attempted takeoff in low vis, the crew believing it to be 15R, and collided with construction equipment. It was subsequently marked 'TAXIWAY'.
And Numpo, I suppose you can remember the little oval 'train set' with the coloured locos with chromium plated bells, next to the north-side control tower? And Monique Agazarian's five bob joyrides.......and the green and cream tubular steel deck-chairs? And the -4's and -6's and CV440's and Connies and Strats........
Aah, nostalgia ain't what it used to be.
('IMC', where are you when we need you??) ( Hey, HD, is 'IMC' on this forum?)
TDM