From what I remember it comes from Julian's first 'Rite' CD. I think the 'Rite' series is some of the best stuff he ever did. Buy it, you won't regret it.
Here's Rite http://www.headheritage.co.uk/discography/showitem.php?title=rite
and here's Rite 2 http://www.headheritage.co.uk/discography/showitem.php?title=rite 2 ...which I think I like even more than Rite.
There's also Rite Now: http://www.headheritage.co.uk/discography/showitem.php?title=rite now You've got to love any song called 'Twilight of the Motherfuckers'.
And not forgetting Rite Bastard: http://www.headheritage.co.uk/discography/showitem.php?title=rite bastard
Just buy 'em! They're ambient, trancey and Moth and I nearly always listen to them when we're out stone-hunting.