Dunno your circumstances, but there is a course available, which will take you from your current position as a plumber to fully qualified gas engineer, job with an employer, own van, tools mobile etc. within eight months. Local jobcentre will give you more details, ask about the Energy & Utilities skills programme. You have to be registered unemployed. Note the word `REGISTERED`, nudge, nudge, wink,wink. There will be tests & interviews but with your qualls you`ll p**s it. Find out the date of the next course, could be 8-12 months, could be sooner, REGISTER as unemployed as soon as poss, by the time it comes up, you`ll be eligible. Easy peasy, lemon squeasy.....Good luck.