Ottercops Chain Home radar station (Elsdon) - Source of Reference
(2) Dobinson, C.S., 1996. Twentieth Century Fortifications in England, Volume 1.4 Anti-aircraft artillery site gazetteer (Council for British Archaeology), 620.
(3) This site is visible on aerial photographs (Ref: RAF 106G/UK/628 10-Aug-1945 4313-4314). Further details about looking at a copy of this photograph can be obtained form the home page.