Basically you'll have to offer your services for free if you want to work with someone who is Gas Safe registered. This way, they'll help with your training and evaluation and you become qualified in return. It's going to be a difficult choice if you have a full time job. Another thing is that there's loads of Gas Safe engineers in Central Scotland, in fact too many in some areas and they're all cutting prices to compete and get work. Some of these courses make ridiculous claims about high earnings, when the reality is anything but. A G3 unvented course is a better prospect as there are fewer plumbers here that are G3 qualified.