So I finished doing the belt today. Having watched the forum DVD (which is excellent) it's not to bad a job. So my findings when doing the job.
1. I didn't fully remove the plenum chamber. I unbolted it and then suspended it from the bonnet using a ratchet strap.
2. The water pipe which runs across in front of the block doesn't need to be removed however if does make things a lot easier.
3. You have to use the markings on the belt. I've never used them in the past on other cars however with this v6 it's a must.
4. While talking about the markings. I used a Gates belt kit. There are markings in white and yellow however don't think you use just one colour you use a mix of both and ignore some.
5. I was amazed how much you could adjust each bank by adjusting the rollers (not the tensioner)
6. Being patient and lots of tea drinking is a must "smoke if ya got em"
Findings of my old belt. My old belt had covered 29k miles but was 6 years old. The actual belt was in excellent condition. You could still just make out the markings on it and they told me it was a GM supplied belt. The tensioner and guides where by SKF which were also supplied with the new Gates belt. The tensioner and guide assembly was in excellent condition. There was no play in the bearings and they ran smoothly and quietly. The guide which is on it's own was worse for ware. The bearing felt very loose and was notchy when spun. It was also very noisy.
So I'd say I've had a lucky escape. How long the guide would of lasted I've know idea however it just proves that mileage alone is not a good indicator on belt condition. Mine could of covered another 11k miles before it was due however I feel the lower guide would of lunched its self long before then.