Perhaps nobody can recall it being done? If the base was Lossie, I suppose the SAR Seaking 'may' have been able to drop some flares into the Moray firth - never heard of it happening though and (no offence to ATC or Base Ops), I doubt they would be able to get such a plan in place at short notice.
The mighty MR2 did drop many a 'flare-path' , usually at some distance and a random orientation from the survivor
Just kidding - having manned the bomb-bay periscope many times, I can testify to the often uncanny accuracy of the flare-path to lead us back to an on-top.
Sorry - no pictures.