According to Cruickshank, this emplacement is a type 28 pillbox modified to take a WWI vintage 13-pounder field gun issued with 25 rounds of solid shot intended for use against armoured vehicles.
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Gun emplacement. Just south of Waverley Mill Bridge. OS reference [http://getamap.ordnancesurvey.co.uk/getamap/frames.htm?mapAction=gaz&gazName=g&gazString=SU870455 SU870455] Photographed by me (Gaius Cornelius) on 19-Mar-06.