You're wecome. To bring you completely up-to-speed, when I asked what was connected to the load side of the RCD FCU, the answer I got was "3 double plug sockets in the garage". I then asked for confirmation that nothing was plugged into any of those sockets, and that nothing other than those 3 sockets was connected to the FCU, but have not yet had a further response.Yes I asked about loads, so to eliminate any appliances. ... Thank you kindly for clarifying, where we are thus far. As I have not been keeping up with the posts/replies.
Kind Regards, John