add socket next to old socket £50 , now needs full surge and rcd that will be £600 please.
in reality risk assessment should be carried out to determine whether SPDs should be installed
To me this is a much wider issue than SPDs, the same occurs with RCD etc.
I have said it before, but some OAP wanting an additional socket outlet, well it needs RCD, but the fusebox is old, so needs a new cu with SPD, and rcbo or dual RCD, plus perhaps replacement lighting wiring (no cpc) etc etc.
So granny doesn't bother - it's been fine for the last 40 years, ends up running an extension for the Xmas tree, and tripping after the zimmer catches the lead!
Really should be an option for improvement, but not necessarily all the way to the latest and greatest - it's better to make some safety improvements rather than none at all.