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Originally posted by Dallas:

In the picture, are those mounting screws in the corners, or adjustable trim pots in the lower pics?

These newer modular types use the DIN rail. Another aspect of the increasing "Europeanization" of British fittings.

The screws are for connection to the circuit conductors and busbars.

Dallas:
See, I'm bilingual. I speak British & American! People here keep telling me off for talking about gasoline and the trunk of my car. ("Petrol" & "boot" here.)