I believe these are some of Metcraft's Wornum designs, specifically the Small Grey Wornum. Metcraft are not the only manufacturer of these lanterns, with the Wornum having originated with REVO, and newer versions produced by DW Windsor and Urbis respectively. Not much information is available on the Metcraft Wornum nowadays, but they are known to have ran SON or metal halide lamps.

London

This one was spotted on a splitter island where Park Lane meets Piccadilly.

A minicell can be sighted in the side of the lantern's body.