Originally Posted by
randomlegend
Has anyone been with him to a doctor's appointment? He may play it down or not be able to express well how he's feeling (or the doctor might just be shit and need pushing to deal with it properly by someone with the strength of personality to do so). If not then ask him if he'd be happy for you (or whoever would be the best person) to go with him and advocate for him.
Not sure I fully understand the other issues. He's living in the shed or what? Don't really get what you're saying. I doubt there's much you can do about where he's staying unless you can offer him an alternative he wants to take.
With regards to helping him with his depression, making and plans with him and stuff is probably a good bet. Depressed people often don't want to get out and are resistant to it but it does help (even if they insist it doesn't). Something regular like playing squash once a week or something. Trying to convince or logic someone out of depression doesn't work, telling them you're there doesn't work, but actually being there and involving yourself in their life in my experience is much more likely to have a positive impact.
Stuff like CBT is good for depression but accessing it via the NHS is a fucking nightmare in my experience (although you live in a different area so YMMV). If it's something which can be afforded then finding someone who offers CBT privately would probably be very helpful (you'd probably need to look for someone comfortable for dealing with someone with high functioning autism - which it would also help with I would think).