I do not intend to sell this property for at least 20 years....
In which case your argument that it isn't worth doing it properly is complete b*****ks. And by which time, of course, the wiring will be 65-70 years old...
cause my DI assesor (actually local authorities technical organisation) told me that it's OK,(to proceed)
Well he was wrong. But I'm confused - does your council carry out competency inspections for one of the schemes?
but I thought that I'd put it on this Forum,
Why? Were you hoping that you'd get advice saying "go ahead"?
You already knew that NICEIC say "don't do it", and via association so probably do the ECA and SELECT, but you didn't care for that advice, so you went looking for some which you did like.
And having not found any here, where will you try next?
however I won't use this for my elecsa rating case
I wish you would - but you clearly think that ELECSA won't agree with you either. Doesn't your reluctance to put it forward for assessment bring it home to you that what you propose is unacceptable?
I hope that whatever you put forward for assessment you crash and burn, because you have no business thinking that you can become an electrician.