Im not an electrician but am fairly competant. I dont have any sophisticated test equipment other than a multimeter.
I would beg to differ, a competant person would not power up circuits in somebody elses house after swapping a consumer unit without prior testing!
Test equipment is readily available for hire, there is no excuse for not using it, even if you dont intend on notifying.. there is no excuse for not testing for safety.
You should stop doing consumer units in other peoples houses, if you arent willing to hire the test equipment, you are playing with other peoples lives.. do whatever you want in your home but what would you do if your work killed somebody else in their home?
You cannot show any kind of competancy in a court of law as you do not even have test results to present that can show the circuits were ever safe in the first place.
If you cannot identify a duff RCD, have you also ensured the main earth is correctly rated? and have you ensured the bonding wires to gas and water are also in place and adequately sized.
A certified electrician cannot sign off your work, they are signing off the work as their own, when it clearly is not.
That is why there is the notification route, where you can arrange an inspection before powering up circuits so you arent applying power to a dangerous setup, then after testing..
Being you are also doing this work in somebody elses house, I assume you must of swapped the tails over live also? or cut the seal on the fuse?
you also mention it had
I have just changed an old Wylex consumer unit for a new Excel 6 way with an already installed RCD in it.
Unless an RCBO install, shouldnt that be RCD's?