Fascinating - have just read the 'Heathrow Thread' for the first time - I spent a few happy years based in the Central Area with BEA Flight Servicing. Looked after departure snags on Viscount (700 and 800 series) Elizabethans, DC3 and finally Vanguards). Memories of the York freighters and Super Connies take-offs when on night shift - loved the sound of those powerful engines.