Memories of a spotter in the 1970's whilst still at school was travelling up to LHR on a Saturday morning on a Green Line Golden Rover ticket on the 727 bus. After dodging about on MSCP roofs and over to Queens Bld it was off to The Aviation Hobby Shop in West Drayton on an ONK bus.
ONK was the first 3 letters of all the reg's they were bright yellow. Then with new postcards in hand it was back to LHR for the 727 home again. Not exactly a misspent youth..