The problem with the customer buying deep backed dimmer switches.
The IET is carrying out some important updates between 17-30 April and all of our websites will be view only. For more information, read this Announcement
My in laws house has sockets wired in a 6mm spider with single sockets on 16mm back boxes, on hollow breeze, loverly stuff.
We're about to take you to the IET registration website. Don't worry though, you'll be sent straight back to the community after completing the registration.
Continue to the IET registration site