'Would I do continuity of ring circuits ..........doubtful'
so would you just put that ring final circuit on a 32a mcb and assume its ok
You don't assume it's ok, I would do Zs tests around it to make sure it 1 as EFLI path and 2 continuity.
If I found a spur off a spur off a spur off a spur ............... or I found a cross connected ring.........would I do anything, yes I'd tell the customer that according to my bible it needs fixing, but according to his bible, it's worked like that for 30 yrs, and I'm not paying for it to be changed by you.
So what do I do as the electric police, I refuse to to connect it back up ..............and very soon I would get very little work.
You advise that is all you can do, you have fitted a modern, safer CU and so you are leaving the installation safer and you have proven by your tests that the reason you have changed the CU to add the additional protection works .............so unless they are willing to pay me for a full EICR, then what I test is what I listed in post 14
I fully appreciate if you guys want to test everything and do a free full testing regime, then great hats off to you. But the regs are guides, as I always said, I can walk into an installation, and within 15-20 minutes I know what to expect, ok sometimes it still throws me a curve ball, but not often.
I will carry out the tests that I are needed. If I'm changing a CU in a house that the installation is 40 yrs old, looks to have been installed by a DIY'er. I will advise on my quote accordingly that there could be a lot more work involved and testing, and walk into another that is 10 yrs old and looks like it as never been touched I tailor the quote to that.
This is why I see on here CU change .................250-300 pounds ......what the .......... you should quote to the job, if it's half a day and easy then you may quote 150-175 and win it, but don't quote well I'm going to be there all day because I'm going to test this, and this and this and this, and so it's 250-300, you will be undercut by perhaps a lad like me.