treadigraph, thank's for reassuring me that I'm not completely gaga. I knew Neil Williams was involved somehow even if I mis-remembered the actual detail.
The 'Flying circus' to Caithness was at Castletown airfield, I believe.
Oh, and don't try that on Stroma these days. No one lives there now and the lighthouse is unmanned. The sheep farmers visit periodically in the summer months but other than that you'd be on your own.