I happened to be reading this old thread, but can't reply as it's over one year old:
https://www.diynot.com/diy/threads/replacing-a-shaver-socket-with-a-heated-mirror-notifiable.451345/
Which zone must a shaving socket be in for it not to be notifiable?
https://www.diynot.com/diy/threads/replacing-a-shaver-socket-with-a-heated-mirror-notifiable.451345/
If the work is in a notifiable zone, then the notifiable process would be required,
Which zone must a shaving socket be in for it not to be notifiable?