In article ,
PoP writes:

Later this year (it was supposed to be April but that seems to be
slipping badly) it will become necessary to produce inspection
certificates for many electrical installation jobs,

Only for domestic work, as proposed.

and many time
served electricians won't be able to do that as they won't have
C&G2391.

Anyone can fill in a certificate. It is up the the person using
the certificate if they decide to accept it or not. (And for
domestic work, being suitably qualified isn't the proposed
requirement.)

--
Andrew Gabriel