I was a Senior Scout with 70th Birmingham (King Edwards) at the time of the Jamboree. I did not attend, but we spent a day putting up some of the army tents beforehand - the canopy but not the walls. Our patrol took about an hour for the first one, but once we got the idea, we got it down to about 20 minutes (efficiency!), we erected about a dozen by the end of the day. We were all totally knackered!
We also put up an aerial ropeway for the BBC during the event. They were interviewing participants from around the world, and each one arrived to meet the interviewer via our ropeway. Never saw the programme as far as I can recall - all programmes were live back then, I think.
We had great times back then - we could go anywhere in the City, and beyond on the Midland Red. We felt invincible and the world was at our feet!