I have been through You tube's entire back catalogue!........Just been called out to job, constant tripping, eventually found cu buried under the stairs, 3 seperate boards, all rewireable, main tails damaged, burning on top of fuses....A total mess all in all, Said I.. "I'll get the tester from the van" Customer " Will there be a charge".................Said I..."Errrrr Yeah"!.........Customer "Oh.....Can we leave it then" You have to laugh.....They only have power to half the house, sockets hanging off, exposed copper everywhere, no rcd protection to speak of to name but a few........And they are a childminders!........I give up!