Ssssts ??? I'm 34 with a young family. I've been in the plumbing for about 5 years but with current employer for 2. No further training offered. A lot of what we do is now out of our range of abilities. I would really like to go on a few manufacturers courses and actually get to know the products. The lads I work with think a service is polishing the front case.
Site supervisor safety training scheme or words to that effect. Basically it means you can operate a site with men working as your responsibility for their safety etc but if you service then it really isn't worth it unless 15 blokes attend every service..
Manufacturers courses are alright but you'll spend a lot of money doing them with no real financial reward seen on your investment as there is no formal qualification.
I know what you mean about "modern" service procedures. Too many people waving an analyser over the flue and pledge over the case these days but certain manufacturers don't ask for a lot more these days and in some instances stripping the boiler and carrying out the full strip clean can be more problematic then preventative.
People just aren't set up to service properly these days. Years gone by you'd strip it vac it grease it and calibrate it and all was fine for the sake of 60p worth of lubricant and possibly a thermocouple. Due to the nature of appliances on the market now you so much as sneeze in the direction of a burner you better be replacing all the seals and gaskets on it and people won't pay to have them all stocked on the vans. So the cycle continues...
If I was to advise anyone perusing a career in service repair it would be to get as electrically competent as possible (don't bother with part p it's going to be binned)
Get good quality equipment and instruments and know how to use them!
If you're paying for manufacturers training then perhaps compare what they offer vs the Mr combi training that's out there. At least that way you may be able to limit your expenditure. after 3-4 different variants all boilers operate the same way and most use common components so knowing how they come apart is easy if you've done it once.
F gas handling heating engineers are few and far between so that could be an avenue to explore but that's really renewables sector air source.
Cleaner greener energy is going to be a big market one day but I couldn't guess if it will be 3 years or 30 so deciding to invest that way would have to be your decision based on research of your area.