A little polite chatter is always welcome on the forum , in the right place.
In this instance, chatter about what you did, or did not, in an engineering place has no relevance to the topic, and in paticular the staement made by you, and I quote:
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"There is a regulation in place for Electricians, Gas engineers, MOT testers, passenger carrying boat charter owners and light aircraft owners, that states that, they are not allowed to self certify any property belonging to themselves."
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Having asked which regulation you are quoting you take the topic off at a tangent, then say you have contacted Gas Safe and HSE but have not given the information you so clearly knew, or appeared to know, and should be able to give that information without having to wait for anyone.
You then say Gas Safe are a closed shop, and gave an answer that you did not like.
Gas Safe is the regulating body for Gas Engineers and have a very strict inspection regime in place for Engineers.
Gas Engineers have to abide by a very demanding set of rules, not only GSIUR's, H&S, BS, EN, but also manufacturers rules for fitting and inspection and service.
Unlike Electricians, Gas Safe Engineers have to completely undergo full training and assessment every 5 years, at considerable cost, not just updates.