I was a BOAC Engineering apprentice starting in 1968 and the combined apprentice school for both BEA and BOAC was housed in workshops on the ground floor of Viscount House, in wooded huts on the apron nearby and in classrooms wherever a spare office could be found in TBE, the following year all apprentice training moved to Cranebank.
We would all go to the Runway Canteen at lunchtime and in the summer head off across the grass, no fence then, towards the 27L holding point and sit with our backs to a little brick building watching the airliners, I remember most was the BKS Brittania that always taxied out with the main passenger doors wide open until the last minute before take off.
The Vanguard club was northside and the Hatton cross club in Viscount Way.