Possible BBC Documentory

Im looking for the name of a BBC one-off documentory.

(At least I think it is, I cant remember there being any advertising).

Its was a documentory about a wood in southern England. The program starts witht he camera cicling what looks like an old oak tree as the seasons are changing.

The person who is narrating walks regularly through the wood with a dog but the dog dies ( I think). So now the narater is looking through the wood through new eyes and sees the wood throughout the four seasons.

Do you have an idea of the date of the programme? People featured in it? Places?

You could try searching the BBC Programme Catalogue at http://open.bbc.co.uk/catalogue/infax/

It was a couple of years ago. Ive checked through the list with no luck.