Dave Plowman wrote:

I'd look for one with an external power supply. That converts 240v to the
low volts for the set, and have that out of the danger area. I'd not
really like the possibility of someone operating a mains switch with wet
hands while touching a good ground like a metal sink.

Thanks for that: it's a good point, though there are already plenty of
mains-operated appliances in the kitchen and (so far) I've been wary enough
not to switch any of them on or off while my hands were wet.

Bert