Does anyone remember going on a smaller version of the fan trainer which they used to set up at the old Schoolboy's and Schoolgirls' Exhibition which they had annually at Earls Court and other locations around the UK? (I used to go the one in the Kelvin hall in Glasgow). I think it was run by TA soldiers from the Parachute Regiment.
I remember queuing for ages to climb up the tower and then have an exciting descent back to ground level. It could only have been a quarter the height of the one in the photo, but it was scary enough when you were only ten!