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A bit of the now demolished QEII (Queen Elizabeth II) Park running track in the "Gap Filler" on the old Deka site in New Brighton (last occupied by a charity barn before a major fire and subsequent demolition).
According to the sign it can take about 30 minutes to walk from the entry point (here) to the centre and out again. That is without stepping across the gaps between bricks. What you can do with a few thousand old bricks and gravel!