Hi Vic
Just stumbled across this thread 
Grrrrr to the useless college. They never did 'get it' did they?
Foundation degree is a good way to go.
He'll be eligible for Student Finance and for Disabled Students Allowance.
Don't know how much you already know so forgive me educating the already educated 
UCAS form applying for the course is the first step. he'll need to submit a personal statement saying why he wants to do this etc - blah blah (easy)
Fe College then make him formal offer of course which he then accepts via UCAS.
Then you need to fill in Student finance application see directgov.uk/studentfinance
You should tick the DSA box on Page 1? of the application form - they'll send another form for the DSA application.
He can use the Student finance form to apply for loan for tution fees - which will be paid directly to the FE College by the Student Finance company.
Don't worry of the student Finance people haven't procesed this by the time he starts FE College - it's enough to show the College that he's applied. they'll wait for the money.
As he gets DLA he'll be eligible for a 'Special Support Grant' it's means-tested on you and your DH's income. My DS gets £1211 pa and it doesn't have to be repaid. If he takes the Special Support Grant he won't be eligibl for a Maintenance Grant - but that's OK.
He can also apply for a maintenance loan for everyday expenses.
You'll need to decide whether to apply for the full Maintenance Loan (which is repayable) or just part if he is continuing to live at home. That too is means-tested on your joint salaries. Don't worry if that hasn't been processed in time - he can apply for that at any time up to about May next year so it just be a matter of you subsidising him until the loan came through.
The DSA will take time.
As I said, they'll send you the application form. You need to prove that he has a disability - i.e. DLA award. You then send it to your Local Authority to get them to agree to fund a Disabled Student's assessment. That can be undertaken by the College itself or by Prospects. That assessment will identify allthe help and support he'll require at College - e.g. laptop, one-to-one support etc. Make sure they get *all8 his difficulties listed and supported (a bit like a Statement).
The LA are then told how much it will cost to support him and they then agree to a fund the Disabled Students Allowance. Ours is about £1600pa. Things like the laptop are ordered directly by the LA from a company and are sent to you. The rest of the money will fund support - so it goes to the College for them to hire in staff as necessary - that's how ours works. In DS's case they hire in an NAS support worker (Prospects can help you with that too).
It all sounds very complicated but it's just a mater of slogging through the forms and hastening them - DSA assessment is the most important of all these applications.
Meanwhile you'll need to take him along to open a Student bank Account into which Student Finance will pay his student loan and special support grant in 3 equal amounts - one for each term.
If he's planning to live away tell me - ther is another whole host of applications you'll need to make for that.
I think he's making the right call by leaving Toss-pot College (you really should name and shame thse fuckwits).
I've always said to you that HE is a totally different game - the support really is there.
Best wishes - W