These are the Circuit Breakers from an MK Consumer Unit. When I had an electrical test done the Main RCD (LN 5780) Tripped but apparently not quite fast enough to pass a current safety test. However, as far as I know all of the individual MK Circuit Breakers are fully working. I was unable to get a replacement LN5780 RCD (apart from second hand !) so ended up fitting a new Consumer unit which does not use these type of circuit breakers. If you can make use of them (I would recommend that you are, or consult a qualified electrician) then let me know when you can collect them from Bathford.

MK Breakers for Consumer Unit (Bathford)