I heard the choice of music was more-or-less accidental though - something about that they just used Strauss as a test soundtrack but it seemed to fit so they used it for the final film.

I guess we need an appropriate swan song. This is the best I can think of.

Deee daah daah daah dee dah
Deee daah daah daah dee dah
Deee dah-di deeee dah-di dahh di dah dahhh
Deee daah daah daah di dah
Deee daah daah daah didi dada
Deee dah-di deeee dah-di dahh di dah dahhh

(key change, continues)

(Though thinking about it, The Swan might have been more appropriate!)

rab]I'll just venture in while the door is still ajar, did it start out on BBC2? Cracking 40 years self-congratulatory best of type clips.

[Inkspot] Annoyingly at an orchestra rehearsal last night so couldn't watch this. No it's not a TV theme, but a piece of Classic FM-friendly music.

What time signature - it could fit into 6/8 or 4/4 from where I'm sitting?

I think it's more like a slowish 3/4.