so in short, alec (Alec trician) has to report himself as doing the work, for it to be inspected by some one who has no probable idea of if it is correct or not, and then a certificate will be issued to Alec, which Alec will have to have paid for, which Alec incorporates into the origonal quote for the said work, making the price higher for the quote.
But without the certificate when the owner sells the property they must produce any certificates for any extra completed work, but they can not since they do not have the certificate. so no sale / less money to get the work certificated.
Not that i suggest the following, but take your average 3 bed semi, how do you know how many sockets / per room it had when it was first built, or when they were added to / rewired.
go figure.