A square structure approximately seven metres across is visible on aerial photographs of the 1940s on Porlock Allotment, centred on circa SS 83834298. Three walls less than two metres think are visible, the fourth, south-east facing side, remains unenclosed. The structure is orientated roughly north-west to south-east, and appears to be aligned upon a dense concentration of unusually regularly patterned artillery craters of Second World War date, approximately 250 metres to the north-west. The structure may be the remains of an observation post or firing range blockhouse associated with this evidence for munitions test firing or target practise. The structure is no longer visible on aerial photographs of 1973 but remains of footings may survive. [1-4] During a walkover survey performed by Cornwall Council, it was suggested that this site may have once been the site of a prehistoric field boundary, now remaining as an "L" shaped spread of stones and clearance cairns. However, the above evidence suggests that this is unlikely. [5]