Sometimes people seem to just drop "off the radar" of the NHS. Maybe you could ring his GP and just have a little chat. They usually do encourage people to stay in their own homes as long as possible so they should help. Failing that, why not ring Social Services and say you want to help him stay there and were they aware he lives on his own with a serious medical condition where he can injure himself by falling. Maybe Sqad can give you advice what you can do and who to contact?