It's a wonder you guys in England don't have more theatre fires over there.
Using heavy pieces of metal, as circuit protection is just really silly, especially considering where this sort of thing is being done.
I've also done quite a bit of work for our local dramatic group and man the first week of me taking it on was fixing up most of the "wiring" of the "Electrician" before me.
It was a sight, I can tell you. Grrrr