What's a listed building? According to Historic England's newly listed structures a listed building includes a street lamp in Sheffield which was designed to burn off methane and other gasses which accummulated in Victoria sewers.

A listed building is a building of special architectural or historic interest which is included in a list compiled by or approved by the Secretary of State. It can include (a) the building itself (b) any object or structure fixed to the building or (c) any object or structure, within the curtilage of the building, that forms part of the land since before 1 July 1948. Hence a street lamp can be listed as an object within the land.

The significance for the owner of a listed building is that it may require listed building consent to demolish, alter or extend the building. This consent may be required in addition to planning permission or by itself for works to the building, land or object.

Other unusual recent listings by Historic England include a Neolithic henge in Yorkshire and a Victorian gin palace in Ilford, Essex.