I'm starting to think the washer is OK, its just the socket that's causing the problem, as only the plug got warm, not the cable. Its a moulded plug too.
I don't think she's ever changed the fuse from new, but I'll get a 10A fuse when its fixed
Her house is rented so she'll have to get the socket sorted by the landlord I think.
If it was my house I'd put a new plug on the cable and try the machine in another socket, and keep an eye on it.
thanks for the advice guys,