2 x 4.7″ QF Mk4 on Mk3 mountings to start with and 2 6″ BL Mk7 on P8 mountings later. The degree markings on the gun mounts do not appear to correspond with a compass in any way, the 0 on the ring in the fourth picture is pointing SSE.
Rerwick Battery is a scheduled monument. Rerwick Head, coastal battery (WW2) and camp, East Mainland, South Ronaldsay and Burray, Orkney Islands (ancientmonuments.uk)
Pictures in gallery below are from 2002 (except last one)
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Pictures showing surviving studwork in BOP from 2003. The stairs in the picture have now completely rotted away. Some of the studwork is still present. (2022)
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Pictures below from 2019 showing some damage to searchlight house no.2 and drainage works to the Fire Command Exchange.
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