There was another interesting video made about the Sunderland,I could not remember the title but managed to have a rummage through our extensive (and very sad) DVD collection yesterday
It is -
An Appreciation of ML814 - The Last Sunderland Flying Boat
A nice video covering 1991 - 93 and the C of A flight testing/Kermit training,pretty good quality visually and with some interesting dialogue from Ken Emmott,Kermie and Vic Hodgkinson (who I spent a very enjoyable 60 mins with (many years ago) up in the Flight Deck of the Solent Sandringham chatting about flying etc) and Peter Smith.
Looks like it is still available from the Original Film Maker
https://www.patrickkempe.co.uk/dvd/t...lying_boat.htm
Peter Smith (the ground Engineer) also wrote a book about the aircraft although it is reasonably expensive now.