During the 1970s the Department of the Environment produced a number of themed guidebooks to explore a group of sites. Stephen Johnson produced one on the Saxon Shore (1977) to cover the string of Late Roman forts that ran from Brancaster in Norfolk to Portchester in Hampshire. The site of one lies in Suffolk: Walton Castle at Felixstowe (although this has now dropped into the sea). Burgh Castle is now in Norfolk (although it is in the Suffolk volume of Pevsner).
Johnston’s 28 page illustrated booklet, printed in landscape, covers the British forts. There are also maps showing the parallel forts from Holland and France.
There are short descriptions of the British forts (some with aerial photographs or plans): Brancaster; Burgh Castle; Walton Castle; Bradwell; Reculver; Richborough; Dover; Lympne; Pevensey; and Portchester.