Sealing bricks for back box, Victorian house?

[Nozzle]

Yeah I read this could make the box sweat and maybe cause other issues.

Aint too much wrong with a sweaty box. It depends what she's planning to do with it longer term...

Nozzle

 

[winston1]

I think you used to be able to get flush plastic boxes, but I only ever seem to come across them on on 1970s installs, deffo not a surface box or dryliner mi-used. Never seen them for sale. I'm not sure why they dont still do them (unless I'm mistaken). I cant have been the only one to have seen them?

You are right. Woolworths used to sell them in the 1970s. Never saw them anywhere else.

 

[OwainDIYer]

You are right. Woolworths used to sell them in the 1970s. Never saw them anywhere else.

A bit like those BC lampholder adapters with the little grub screw 'for safety'