Little Castles
Muswell Models make cast buildings, primarily for model railways. The range of OO/4mm pillboxes interests me (there are even more in 2mm/N scale, but that scale doesn’t appeal as much to me). I have visions of a diorama at a crossroads with bored squaddies peeling spuds and stripping Vickers machine guns as they wait for an enemy that may never come.
Pillbox information-
20th century war
Pillbox types
The spigot mortar (not strictly related, but interesting nonetheless.)
Pillboxes and defensive positions around Mount Bures in East Anglia
Technorati tag: Scale Models, Pillbox