According to our council there is no discounts or help for anyone with council tax any more and it’s going up again.
Don't believe it OP. Councils have a habit of making shit up. They can't make up their own rules which bypass national law! There's a means-tested council tax scheme nationally for people on a low income, which includes people on nothing except benefits. You will be entitled to some kind of discount. If the council won't tell you how to apply for the scheme, you'll need to join some group locally full of poverty stricken people who will know the answer to that question of how to apply because they're claiming it themselves.
my youngest is now 20 so not entitled to anything for him. He can’t claim uc due to being in college full time, he can’t claim student finance for that’s uni only. he wants to work but everywhere he goes he gets turned down due to his own issues and his college times. - he still hasn’t passed his maths or English
OP it's late and my brain is switching off now so I'm not capable of writing this in a politically correct way right now and for that I apologise. You and your son needs to accept he's thick. He's 20 with no maths and English, if it hasn't happened by now, it's not going to. He needs to stop pissing about with college and go get a job of some kind.
I agree with poster up thread, sign up with employment agencies for temporary work, doing whatever he can do. They won't care about qualifications they'll only care about what he can actually do. The more temporary placements he gets, the more experience he has and the more things he can do, all of which helps him to get a permanent job.
Once he's no longer in full time education he becomes eligible for and can apply for UC for himself. Which between that and the intermittent temporary work, will enable him to pay his way with his share of food, utility bills and council tax while he still lives at home.