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The story of this important memorial is given at the . Behind the tower of glass, in the side of the small creeper-covered block, a book of remembrance is displayed behind glass. This book "starts with an unknown constable killed in 1680. There are nearly 1,600 names recorded, of those officers unlawfully killed while in the execution of their duty, or in the course of effecting an arrest or the performance of acts of gallantry or other hazardous duty, taken from the 4,000 names on the National Police Officers Roll of Honour of officers who have died in the line of duty."

The smaller creeper-covered block conceals a large concrete London Underground vent shaft. The larger leaf-entombed structure behind is the Admiralty Citadel, built at the start of WW2 as a bomb-proof command centre for the Royal Navy, the Admiralty being the building behind that.