Which reminds me to ask : a few years ago there was a plan to open the UK's first "helidrome". It was going to be in Chiswick, London. Now - this was around the same time as "Tomorrow's World" was showing off a working heli-trainer that was a combination of hyraulicss and electronics. This thing would move around on a pad (about 20 metres square, it looked) and you could "fly" it. It had a collective and cyclic - but was more like a hydraulic supermarket trolley. If it flew too close to the edge of the pad, the electronics brought it to a halt.
So - what happened to this ? And is it all related to the machine above ?