How bad is the "cowboy trader" situation?

To give you an idea it does state on the Corgi website,
I quote:
"CORGI has carried out the industry’s first research into the illegal gas market and concluded that there could be as many as 20,000 people working illegally on gas in the UK" un-quote.
This information can be found at: http://www.trustcorgi.com/cowboys/fightthecowboys.htmx please take some time to view this very disturbing claim, carbon monoxide kills, you must ask for and check the ID badge of your installer. ALL governing trade bodies have websites, it is a good idea, for your peace of mind to view them.