I hate people who aren't registered for two reasons.
1. I pay for registration exams and insurances so who shouldn't they. Although gas safe will simply pass the book on to building control, who are under resourced and have lots of other stuff to do. Gas safe only bother if some one has died... And HSE have done all the work or if their membership is low in one area. Capita - who operate gas safe are a profit making company and in my opinion only offer a lip service. I I.D. A job on about 5 or 6 different pints from obstructed flue to leak on gas pipe work. GS went and had a look, installer who wasn't even registered got a letter to say he should join GS, I got hauled over coals for not noticing an appliance in a disused part of the building which had to be stripped to find data badge to identify that 75% of ventilation was not present and should have AR! Needed to unlock two doors and strip appliance!!!! Tad past visual inspection. Gas was capped at ECV any way so would have found it when doing purge and relight!!!!!!
2. Non registered are usually muppets and or on what is know as mate safe. They have a mate who is stupid enough to sign off for them? He's loosing business and could help some one loose their life. But landlords love a bargain!