On Thursday, 6 June 2019 14:01:31 UTC+1, DerbyBorn wrote:
My plasterboard walls are not thick enought to take a deep enough box so a
pattress is needed - however, it is a 1988 installation.

Can you use a combination of a shallower box and a surface extender?

https://cpc.farnell.com/bg/818/pattr...cer/dp/PL08925

https://www.screwfix.com/p/schneider...er-white/2105j

There is also the MK K700RPWHI shaver socket, without transformer, if you can fit a socket outside the bathroom or a transformer remotely.

Owain