Er, yes indeed...
I had a short "debate" with EDF (before they sold the cables to UK Power) about me installing a Wylex REC2S islator in my meter cupboard.
I told him that they could remove it should it ever get in the way of new equipment, but at £35 per session to get the cutout fuse pulled, Iwould prefer to have it unless they could supply an equivalent means of isolation
- which they couldn't.