The Rovers are No Problem but don't scoff at met balloons. When I was an apprentice at Aberporth I helped install a new hydrogen feed line into the Balloon shed. The guy who used to launch the balloons showed us some pictures of what happens if it goes wrong, scary stuff. Especially the before and after shots of a balloon shed. The after shots looked like a prefab garage base, two courses of bricks around a concrete base! He also told us that the sheds are always built with a door at either end. You launch from the leeward side and you
always stand in the opening when inflating the balloon. This point was driven home to him by the met office instructor who had found himself coming to fifty feet away from the shed with nothing on but his boots!
Do they still use Hydrogen these days or does Elf and Safety make them use helium?