The main reason is that it serves to protect homeowners and businesses from potentially dangerous work from unlicensed individuals.
It protects your manufacturers warranty and also your home insurance warranty, as both of these become void if gas work is carried out by an unlicensed individual.
If you have any questions or concerns about your Gas installation or would like a site visit to determine if your gas Installation complies, please feel free to contact Gas Tech Plumbing and we would be more than happy to help.