Chaps, hope your all not getting bored by posts re timing belts etc....but its getting near that time for many of us....or is it?

I went to book my GTI into
www.a4audi.co.uk, a well respected and trusted independent. The main mech there called VW and asked what the intervals were on the cam belt. VW stated 5 years or 80,000 miles.
This surprised me as local main dealers are stating 4 years and 60,000miles.
To verify I went to
www.audivwrepaircentre.co.uk, again a recommended and respected indy. They stated 120,000 miles OR 5 years.
So....I just called VW Customer services (0800 333 666), who state 4 years....OR 120,000!!!...
So, Four places and Four different intervals.
I know, I know, I know PREVENTION IS BETTER THAN CURE and this has been discussed before about the need to get it done, but I have circa 36,000 miles and am only 3.5 years in!
Thoughts? Does anyone have any documented evidence from VW that the intervals are 4years and 40k out there?