Yes I second that. Isolation is particularly challenging for alcoholics. Socially distanced counselling isn't going to be enough probably. You could try contacting the community mental health team on Lordship Lane.
They are likely to know best what help is available at the moment for someone in his circumstances. Also, he can get a referral to them from his GP if he has one. All CMHT's have crisis teams, so I suggest you ask to speak directly with someone from that.
It sounds to me as though he needs some kind of outreach visit to assess his needs. That he confided in you is a good sign that he is willing to get back to the recovery stage he was at. So I would stress that it would possibly be productive for any resources to be made available to him.