Ok I've been down a proper rabbit hole now.
Not in my area (which is oop north)
So you can ask at the job centre for funding for courses, yep, but they wont fund this bricklaying course, not even the beginner one and theres three levels. So you need at least 3 grand. You can fill out forms at the college if you know about them (they are reasonably hidden and you'd have to know what to look for) but they only cover clothes, lunch, transport and 3k for childcare a year, not per course. Not the actual course fees.
You could, again if you know about it ask for bursaries from a couple of different places, which involves yet more form filling and a wait for a yes or no. In the meantime if you managed to do all of those things and were successful you'd lose your benefits as soon as you started the course. Because your are not then available for work which is the basic premise of job seekers allowance.
So now you are without benefits for 12 weeks, the length of the course. Still got to pay the bills and have a fight on your hands to reclaim in 12 weeks.
Then finally each course is only run once year, so you have to do this all again next year and the year after to get your qualifications.
I'm pretty good with stuff like this but I reckon I would give up after the first bricklaying course, I could not deal with that stress again next year when no doubt the qualifying criteria for each element will have changed.
And that's just the bricklaying.
I didnt even look into roofing or plumbing.