I should make this a bit clearer, Meryl. It's not the actual appliance that's the problem, it's the socket.
Sockets should be minimum 3 metres etc. It has been known for machines to be in a bathroom, but hard-wired into a fused spur, or plugged into a different room with a long lead, and a small hole in the wall.
The RCD bit does apply though if it's a fused spur. The Regulations don't actually rule on one being plugged into a different room.
So much grey area here. Most Electricians disagree over interpretation. That's why they invariably "play safe" and refuse to do it.
This would legally be notifiable though. It just means a Certified electrician is needed. I would certainly consult one though, if you want to go ahead. It would need a visit. That's why I can't be certain on here.