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I can't find details online, but they do a local trail which takes in them, BR3WERY just up the road from them, Southey in Penge and Ignition in Sydenham. I think you can get a brevet card type thing, get a stamp in each and claim a badge.
Three Hounds is excellent; a great selection of beers, including some of their own, plus they put on comedy nights, music nights and organise a local makers fair event. A really positive contributor to the local area.
Recommend Three Hounds in Clock House if you're ever in the area