Ach, we're all of an age, I was at Windsor GS from 61 to 68; used to cycle or hitch to LAP, remember the tunnels, pretty sure both side tunnels had a cycle way and a raised fenced footpath to one side. My memory of the terminals agrees with SSK; when I started with BEA in late 68 shorthaul cargo was still in Hangars 7 & 8 near Hatton Cross. Cargocentre opened in what, 71?