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Have you looked at the gym group? Not been to the Walthamstow one but I use a couple of them since starting training again . Open 24/7 and for about £30pcm I can use any five gyms and bring four guests. The two I use definitely have all the kit you are after; Colliers Wood has two dedicated squat racks, two squat / bench set ups and two dedicated benches.
I think you can just buy day passes to try them out.
Anyone know of a decent gym within ~30 min ride of walthamstow? feel like I'm done with lifting at the climbing centre since they have such a small amount of equipment. Main desires are multiple squat racks / deadlift platforms, and ideally benches with safeties.