Argh, you've all missed it, the future and there's loads of money in it,
imagine this, one point one rcd/mcb, we'll then have different coloured sockets a bit like in hospitals, but we'll have more colours, then manufacturers will supply equipment with coloured plugs on too. If it has a red plug it needs a type A rcd, which is indicated by a red socket, a type B by a blue socket, etc, etc.
Arriving on a call out to a tripping RCD, "it's ok madam, I don't need my test kit, I can see the problem straight away, some idiot has put a green plug into a blue socket" , don't laugh, it's the future, probably.