What about volunteering? Gives you the opportunity to help others less fortunate in some fashion and puts you in the company of other like-minded (I.e. altruistic) people.

Some people swear by getting involved in a local church. No matter what your religious bent, unless you go to one of those hellfire and brimstone scare the shyte out of you places, any church I've ever attended imparts a feeling of peace and calm to me. You don't have to have a grain of actual "belief". I just think being in community with people who want peace, absolution, redemption, an uplift - whatever - is of itself comforting. Try it.

There's meetup.com, too. Look in to that.

Lastly, there are depression support groups all over the world. The US has NAMI and DBSA. I'm sure the UK has something comparable.

Don't stay isolated from people. Find ways to get out and be with people. Loneliness kills. It almost did me. Good luck.