My mate is a corgi reg'd plumber/heating engineer and he's known about it for a while. Theres one thing thats annoying him, even though he's corgi reg'd he will have to pay AGAIN (bout £700) to be Gas Safe Registered. Luckily he hasn't got a van yet so sign writing isn't one of his costs.
Link to Official Site ==>
https://www.gassaferegister.co.uk/