Ring them and ask. They were perfectly happy for me to break their
seal on the cut-out (main fuse) in commercial premises in hertfordshire,
and they never bothered to come and replace it. They didn't even bother
to replace it when they came a few months later to uprate the fuse on
another phase in the same cutout.
I have never been asked, but others have. I suspect it depends if
the job looks like it has been done to professional standards.
I don't think the guys who deal with the cut-outs and meter tails
will do it themselves. If they are concerned, they will ask for an
Don't bother informing them until afterwards. Break the seal on the cutout
fuse and remove it.
I don't believe they can insist that the circuit is tested before
reconnecting, as the tests require electrical power. In particular, the
earth loop impedence test and the RCD test require AC to be present to work.
You should inspect the installation and do insulation resistance and
continuity testing before the power is reconnected.
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