Sadly, there are still engineers out there who have no qualifications to work with gas who are still installing boilers. In recent months custodial sentences have been handed out to plumbers who claimed to be Gas safe registered and were not. They carried out work that was not to current standards and in one case dangerous. Please do not put your home and the ones you love at risk, always check that the engineer working on your gas installation is qualified and registered.
Do not accept a logo on a shirt or a vehicle as proof. Every gas Safe registered engineer has a gas safe card with his photograph on it. Ask to see it.
Be Smart, Be Safe.