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On 23/07/2019 21:55, wrote:
AFAICS there is nothing preventing a regular wallplate switch being used
to control an electrically-heated towel rail in a bathroom provided that
the switch is outside zone 2 and the installation is protected by a 30mA
RCD. Have I missed anything?

Answering my own question ... although there is nothing specifically
against it there is the general provision that every item of equipment
is to be of a design appropriate to the situation in which it is to be
used, or its mode of installation shall take account of the conditions
likely to be encountered. Condensation is a concern so I'll put the FCU
outside the room.