One approach I have seen is to wire the dryer to a 13A plug and socket.  I guess that makes PAT testing the dryer a lot easier.

and worries folk who do not like plugs and sockets near places where folk have wet hands... I suppose you could have the plug and socket near the ceiling and a long flex running up the tiles in some stick on trunking, I'd consider that a bit of a hack, and my standards are not the highest.

Mike.

Is it any different to having plugs and sockets in kitchens?

In terms of both potential abuse/vandalism and consequent liability, wet skin in public toilets are probably higher risk to the installation owner than say a private domestic kitchen.

   - Andy.

In terms of both potential abuse/vandalism and consequent liability, wet skin in public toilets are probably higher risk to the installation owner than say a private domestic kitchen.

   - Andy.

The installation owner probably seldom visits the premises, but I think that I know what you mean.

I find it hard to believe that using a plug and socket would (could even) give rise to a claim in tort.

Returning to the original question, there is nothing complicated: I'd opt for a 4 mm² radial to FCUs.

Sorry - I reading my reply again I realise I wasn't that clear - what I was trying to say was than public toilets often suffer a higher level of abuse/vandalism/damage - so the designer might well think it appropriate to take additional precautions over and above general BS 7671 requirements, in order to protect whoever the user happens to be from electrical harm and installation owner from the consequential legal liabilities. You can imagine a lawyer was it really reasonable in the circumstances to omit 30mA RCD additional protection (even if BS 7671 permits that in the general case) or make available a 13A socket available to plug in a phone charger in such an environment.

   - Andy.

AJJewsbury said:

You can imagine a lawyer was it really reasonable in the circumstances to omit 30mA RCD additional protection

If I can remember tomorrow, I shall see if I can find out whether the hand driers in the courts have RCD protection. The sparks was in last week so he might still be there on Monday.

The sparks was in today and no, the courts in which I sit do not have RCD protection on the hand-drier circuits, so that answers Andy's point. :-)

He told me that he was changing a florrie in another court building once. He had poked his head above the false ceiling and unplugged the lamp fitting at which point he got a belt off the plug. It turned out that somebody had "borrowed" a neutral from the lamp fitting.

My conclusion is that it may be safest to use paper towels from now on.