I have read the thread and all your answers OP and this is my tuppence worth.
see this as a joint venture. because it will be whatever job he takes on or new business he starts. from your point of view, grow some balls, go in and explain that you have had a change of circumstances and that you need to earn more money. either they increase your wages or they accept that you are going to leave. then look at the transferable skills that you have in terms of caring, organisation etc and look for other work. we pay our office cleaner £11 an hour. its less than our staff but a fair rate for the job imo. there are other jobs out there that you could do so start looking.
put the redundancy money in the bank and don't touch it. at all. your dh needs to do a few low paid jobs for the next couple of months so that he can wise up and see how the other half lives in terms of work.
he has to give himself at least 3 months post job before jumping into something he really does. call it a grieving period if you like but his old life has gone and he needs to see what the new possibilities are.
the things he has suggested at the moment are a bit bonkers to be honest. recovering alcoholic running a gin bar? no one else spot the flaw in this. also bus hire - what will his usp be and how will he compete with companies that have several vehicles.
I get that he doesn't want to discuss things with you and gets huffy but seriously? he better learn to because this is what running your own business is like.
you have to be a realist. any business you run has to be able to wash its own face after 3 years but for the first 2-3 he will make absolutely no profit. he will work 10X harder than he did before. he wont get to go off sick. he probably wont go on a family holiday. he will be working anti social hours and have to be nice to people he doesn't like.
don't get me wrong. I love being self employed but would I choose it now knowing what I know now? no I wouldn't. 20 years in local govt, local big pension, 6 weeks plus holidays, unlimited time for sickness and hospital appointments but best of all lights off at 5pm on a Friday and not back on until 9am Monday.
do you have a local chamber of commerce he could speak to? or perhaps a local business association? hearing it from others might be a help.
he can message me any time if he wants to talk through ideas. I do a lot of voluntary work with business advice and I know the pitfalls of starting a new business. happy to help him but only if he wants to be helped and wants to have a big dose of realism.