On Sun, 1 Nov 2020 23:51:59 +0000, Fredxx wrote:

Just a tip on buying a new one Dave. Try to get one to BS7288:2016
and
not old stock that is to BS7288:1990.

Is there a significant difference?

Donno, but having read other responses I'm very confused.

What is this additional "protection" that a 2016 compliant socket
based RCD requires? Overload or another RCD? If the latter what
happend to discrimination over which one trips first?

--
Cheers
Dave.