Some more on practical considerations for flying balloons.
In the U.S at least, they need to weigh less than 6Ib, have a parachute built in, use rope of a certain strength, have a redundant means of bursting the balloon on command (say by radio and a timer), carry a radar reflector, not be flown at night, and have their position reported to Air Traffic Control by 'phone regularly (usually by the balloon radioing back its GPS coordinates to you).
If you don't know where the balloon is or can no longer control it, then it is declared "derelict", which is a very bad reputation to get!
This is all pretty stringent enough but in the U.K it would be worse.
It is fine for a 6 Ib gondola to plummet out of the sky over the Kansas prairie or whatever but I think your chances of this landing on a house or a road or suchlike in the U.K, with its much higher population density, are depressingly higher.
Also, I remember reading somewhere that you're not allowed Ham radios etc on the balloon in the U.K.
Still, it has been done - any of you remember the "Space Teddies" flown by the Cambridge Uni student space club?
(We should try and get in touch with them). I think they flew from a military range - but that must have taken some sorting!
So - we fly over water (and prepare to get wet recovering it - anybody got a boat or likes sailing?) or fly in the U.S with our friends at NASA, which was always the plan.
But it would be so nice to test some of this in the U.K...
Could we test it on a tether?
The weight of tether would quickly drag it down, but perhaps we could offset this with balloonets (multiple balloons supporting a structure, in this case the tether). How far up could we go?...