CP12 is a ''grey area'' to most I might say? Personally, I charge £60 minimum but can do £50 for ''friends''.
But what stops a supposedly gas engineer charging £25/30 per CP12? What most of them do is walk in, take a look at the cooker and or boiler, make a note of the make/model. operate boiler (if they are in the mood) then sit down and fill the certificate and hand it over? Some of them do it in a matter of 20 mins???
A neighbour who has a few properties asked me to do a CP12 for one of his properties in Norwood last week. There was a slight gas leak, but a leak all the same. All seals on cooker were useless and oven door did not close. WTF. Condensate pipe is just pushed out through wall and discharges in back garden. Same as the PRV. it's just pushed out the wall?
It became obvious that I will have to fail it. So I left and gave him back his keys, asking that the gas cooker be changed before I will even attend. His arguement: It has been no problem for the past SEVEN years and no one has ever raised any of the issues I am raising. As expected, he has not gotten back to me. And I am convinced there is a 99% chance he has been given one regardless.