In article ,
Peter writes:

He also reckoned that MK sentry were rubbish and 'you should have bought
a protous (sp?) CU' ...

They have varied in quality with redesigns.
I think these parts are mostly bought in so MK can present a
complete range. The current plastic cases are nowhere near is
nice or solid as the previous range with the perspex cover.
However their RCBO's are now much better than the ones they
had ~10 years ago which needed DIN rail extenders and different
bus bar connections and where clearly designed for some other
consumer unit. A couple of years ago, I fitted one of these
earlier CU's but with current MCB's/RCBO's, and that made for
the best combination of MK CU bits.

MK's best quality stuff is the stuff they make themselves IMO,
switch plates, socket outlets, etc.

--
Andrew Gabriel