I'm about to install a UK washing machine and am clear on the water and waste thing as there's a dedicated outlet/inlet in the wall. But have a question about electricity. I have a five pin plug on the wall with three round holes as normal and two oblong ones above them (which I understand from the answers on the forum is capable of delivering 380v). However, if I plug a normal swiss 3 pin in there, will that just deliver 220v? I don't want to blow up my apartment building or anything. That would be a bad thing...

I have done a search and spent half an hour looking for the answer, and I'm sure it's on here somewhere, but I haven't found it... sorry.