I got my current chair nearby, possibly where OP is talking about. I wanted to be able to sit and adjust chairs and needed one that would tilt forward. Their selection is a bit chaotic and didn't have the chair I really wanted, but I liked being able to try out a few.

I think you'll have similar success watching Gumtree, craigslist, etc.

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Andrews Office Furniture - Old Street & The City 250 - 254 Old St, London EC1V 9DD