Mostly differnet I think. The one with the solid blue and solid white wires is FO442.
Like Alwall says, that ain't the master.
There should be a master before it with 2 incoming wires going to terminals marked A and B and 3 outgoing wires blue, white and orange, connected to 2,5 and 3. - as Mr Saffron mentioned earlier.
There are no other sockets. There are five sockets in the house and the grey box outside. There are no boxes between the grey wire entering the bulding and disappearing into the garage ceiling. Photos of all five sockets are now online and noe appear to be the master socket.
I don't understand...........