Many thanks Hugh, Roger and Ian for your replies.
Hugh - the most likely cause of freezing on Youtube videos is that it's streaming as it goes along - just wait for it to catch up or drag the play marker back a bit while it carries on streaming.
The Video editing was down to son Andrew, but I did watch him do it so that counts for something
Really don't know why Paul Simon wouldn't let Hank use his Marvin at the Movies BT for his Mastertracks album.
I've had this BT for years but honestly cant remember where it came from. A bit like that Sleepwalk BT which was a freeby with a magazine I think.
If anyone could enlighten me that would be good.
Cheers Phil