Another difference, which I keep forgetting to mention to overeas guests when they check in is the bathroom light pulls. In the UK, we seem to have far stricter regulations about electrical safety than other countries (for example, we have the three point plugs for this reason). We cannot have a normal light switch on the wall inside a bathroom. You either have to have it on the wall outside the bathroom, or you have a pull swich which is attached to the ceiling. This is so that people with wet hands don't electrocute themselves I guess.
We also don't normally have regular plug sockets in bathrooms. The same American guest who broke the walk-in shower was not expecting this. I went into the bathroom and was suprised to find a hairdryer in the basin. Why, I thought, would you put an electrical appliance in a wet sink? Luckily it wasn't plugged in though as she couldn't work out how to do that.
I had to explain that we only have special shaver sockets in the bathrooms. They look like this:
You can use shavers, electric toothbrush chargers, epilators and that sort of thing which come fitted with special plugs for these sockets. You cannot use our regular three point plugs in them. Again, she looked at me like I was insane when I said she needed to plug the hairdryer in the bedroom. And yes, there is a mirror in the bedroom close to the socket...