I found this film a few minutes ago. Not sure what year I’m guessing it might be one of the old RSPB films from the Annual RSPB film shows as said previously now sadly:long gone. I don’t think it was one of the many David Attenborough BBC wildlife films of the past.
https://youtu.be/uWPONIH7Ytk?feature=shared
Regards,
Ian.
Lovely start with sunrise and Nightingale singing! Will watch later when I have some p&q!
2013 photos & vids here
eff37 on Flickr