Thanks for tne tip off Ken. It's viewable now at the link below. It's a 5 minute shortened version of a programme that was originally broadcast in 2011.
Coast - Red Sands Fort 
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Just noticed red sands feature in coast tonight... bbc4 2155
not much time but maybe it will be updated in time for some to see...
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red sands on coast bbc4 2155 - ken_scotland 13/9/2023, 19:43:38
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on 13/9/2023, 22:22:35, in reply to "