Too easy, but funny how it stuck in my mind!
We are talking 65-67 here.
Dave and I were the 2 plt off ATCOs on opposite shifts at Strubby, and occasionally were asked to 'assist' in the RHS with Air Tests and things like that if there were insufficient 'holding co-pilots' to go around the School of Refresher Flying. Our duties seemed to be confined to reaching the switches on the upper right overhead panel (air intake, oil cooler ... thats it) that would otherwise require an orang-utan in the LHS to reach!
We even had our own flying kit at the Sqn, and obviously got some stick time as well. I recall one trip where I was directed to the LHS for a quick Air Test or similar, and told start it up and get going. Was it 12 blades? Young ATCOs avidly read the copies of Pilot's Notes in the Tower in those days, of course!
Can you imagine anything like that these days?