OK, well as I have said I do not touch domestic work, so any Regs that touch on this, unless they have spill over into what I do I have largely ignored as I have enough to worry about..
Interestingly in 701.413 (ii) it does indicate that a single socket outlet may be used as it appears under the title of Protective Measure: Electrical Separation
However with regards to washing machines and white good I would direct peoples attention to Reg 701.55 (iv - Xi) where it lists the types of fixed and permanently connected equipment that is currently allowed within Zone 1 for a room containing a fixed bath or shower, and white goods are not listed.
Thus as it stands, regardless of the rights/wrongs of installing a socket in a bathroom, RCD protected or not, it would be a serious deviation from the Regs to install a washing machine in the Bathroom.
Now if someone would like to challenge this interpretation by all means do.