Lamp box

Their name derives from the fact that they were designed to be affixed to lamp posts,[1] although they may equally be found embedded in walls or mounted on poles.

In 1977, the design was changed so that the cast front was fitted to the galvanised steel back by four riveted lugs rather than 6 internal screws.

The former retained the title Royal Mail Letters whilst the later became Post Office Counters Ltd.

This necessitated changing the castings yet again so that in future they would read Royal Mail rather than Post Office.

The first new Lamp Letter box design for some years was introduced by Royal Mail in 1999.