Either video or audio of this Film Music segment:
British film music, 1/14, William Walton - Battle of Britain - 'Battle In The Air' - YouTube (http://www.youtube.com/watch?v=feJsR1Kgibc)
The above clip is in mono and not widescreen. Here's the 2011 Proms Film Music sequence (not Walton) that shows what the 2007 clip can look and sound like:
BBC Proms 2011 - Film Music Night - YouTube (http://www.youtube.com/watch?v=9KmLxiX8ZTw)

Thx in advance for any effort in finding this piece!