The other day I was playing the gane and listening to the music too. Then I listened to the 3-minute tune a couple of days later, on a CD I recorded. I immediately recognised the tune, and am 100% sure they are the same ones.
I'll check them both out again, and if they are, I'll e-mail you the MP3 which is stashed away on my computer somewhere.
Oh well, thats fine then. I had a CD around the time of the first big brother and it had the tune on it but it was different, it was probably actually a shortened version.
The BB tune on the interactive "game" pages is from the first cut of the Big Brother Theme Tune. It is a 10 minute remix not widely publicised (I think kept only for white label by Oakenfold at the time).