A Royal Navy Westland Seaking HAR3 with registration XZ586 is shown performing SAR operations. The Seaking was not introduced into service until 1978; the correct helicopter to have shown would have been the Westland Wessex HC2.
The skipper of the trawler in distress gives their position as 54°16'N 0°32'W. This is about 5½ miles from Scarborough, in the North York Moors National Park. Possibly the skipper meant 0°32'E, which is off the Yorkshire coast, in the North Sea.