The Entry Stunt of the 102nd Entry of Aircraft Apprentices, No. 1 School of Technical Training, RAF Halton. Otherwise known as the "Ton-Twos".
I guess you're looking for this
There are links to other photos of the event and a written yarn about the stunt on the 102nd's home page
. Look under "site map" - its a bit slow so be patient.
I was one of the Ton-Fives. In September 1963 we occupied the 3A Wing blocks vacated by the Ton-Twos in July and on that web site there's a nice picture of the very room that was to be my 'home' for the next two years.