I'm planning to get my kitchen and bathroom ceilings replastered, and
will be taking the opportunity to fit new lighting. This presumably
falls under Part P. I'm generally fairly relaxed about this, but if I
could comply without too much cost and effort then I'd probably do so.

My council includes on its list of Building Notice prices an entry for

"Work relating solely to an electrical installation where the applicant
undertakes to provide on completion an installation and commissioning
test certificate completed by a person competent but not registered with
a Government approved scheme".

This price I might be prepared to pay (the many-times higher price for
getting them to inspect it, I probably wouldn't).

Is this testing something I'm likely to be able to undertake and have
accepted? I'm not installing a whole new circuit, merely changing a
central rose to half a dozen recessed downlighters or similar.

I currently have a CU with whole-house RCD which, touch wood, doesn't
give any trouble, so I shouldn't end up in the situation where a test
reveals levels of existing leakage that require vast amounts of
unexpected work to rectify.

Cheers,

Pete