Please take this with a pinch of salt, maybe even a kilo of it.
as far as industrys go the gas, oil, plumbing and heating industrys paying to get into them will cost you far far more than you realise.
this is simply down to experience!
In a working day each of us can make a single mistake and thats 200k of damages and possibly even a life lost.
but by doing time served apprenticeships, working under someone for a long time before even thinking of qualifications, revising, learning gas regs, how gas works, how pressurised symptoms work, combustion, dealing with problems you encounter, learning from your peers, safe working and even just how to use tools.
this is what makes us safe as we can be.
the stigma of fast track engineers is them being newly qualified and overly confident with little experiance of possible problems.
my advice would be is try to find someone you can do a few weekends or evenings with and get a feel for it before parting with money for a course.