The Blue Lamp was a classic design, featuring a four-sided heritage Windsor lantern with police decals printed on each side. DW Windsor's version was also available for wall-mount (documented separately). I believe they could run the same lamp-types as the Windsor Lantern.

Birmingham

The Police Stations around Birmingham employ DW Windsor Blue Lamps. It's not known what lamps they run. This first example is installed on the grounds of Aston Police Station.

This one is covered with West Midlands Police decals on all four sides.

Digbeth Police Station also has two wall/cradle-mounted DW Windsor Blue Lamps, I believe these examples are GLS.