Good tune - it was used for the Royal Wedding back in whenever ...
https://www.youtube.com/watch?v=Y1h_FcW2pIM
PS 'London Records' puts up a lot of video clips from that original era that have been cleaned up and restored, eg:
https://www.youtube.com/watch?v=Xg9Wqs4vjZM
is a cleaner looking version of the original video you linked to.