well now i'm going to be devils advocate i think,I am ex services, but did do six years in an apprenticeship there which covered pritty much everything under the sun. When i left i kept up my electrical expertise, and am current with all the qualifications and regs. I did continue doing some pipework and sanitary ware, but not much. I too also decided that i wanted to get into gas, mainly due to the variety in the work and recognition that it can still be classified as a good job. I went back to college to do an appreticeship alligned route via NVQ in gas, and was the oldest one in the class. I paid for the course myself and found that there was a great deal of difference in experience in the classroom. The NVQ practical evidence and experience (which you definately must have) can only be achieved by working with a time served gas engineer. All the other forms of training will still need this, even though they tend to gloss over that on some occasions.My advice would be- If you have no experience in electrical or plumbing services as a time served tradsman, (either in the forces or outside) then do not take on any short courses which promise you qualifications in gas at the end of it. You will need to do the traditional route of NVQ apprenticeship in college, with the rest of the week working with a gas engineer. If you do it any other way you will fail.I was lucky enought to find an experienced engineer, who likes passing on his knowledge, but i do not ask for any wages during the time i am with him.You will be told a wide range of advice when deciding to start in this industry, but i spent some time talking to Corgi (as was), who gave me this wise advice. Going back to school was not planned but the only way. If you are a young chap then starting off with plumbing is the best route. Then while doing that you will be exposed to renewable energies, so you might change direction in due course anyway.As for the comments above, well, nearly all of them are correct in some form or another. The gas industry is going through a considerable change, and the sole trader (who shores up the industry) is sometimes treated quite badyI hope this helps..