Central heating not working (don't ask!), so the wife puts on a couple of fan heaters as well as the washing machine and oven. I decide to take a (40A) shower. I'd taken my Owl upstairs for some reason and as I emerged from the shower, it was showing over 75A usage. I whipped down to the meter to see if my main 60A fuse was in meltdown and it wasn't even warm. It's labelled 60A, but I suspect it's more. Is there any way of checking?