Midsomer Murder Music?

I'm looking for the Music in "Midsomer Murders: Ring out your Dead". The one at the beginning and the end when the murderer is being arrested.

It's a classic piece and also featured in the documentation "the caves of Naica". It's a beautiful choir with classic music. I tried to find out with my music detector on my mobile but to no avail.

Sorry I can't find any link to these scenes. But are there any fans who'd know?