I think this is a tad harsh calling my statement shocking;
We live in the UK, and as such with VW are under control of VW UK guidelines, regardless of the guidelines of the manufacturer and those of VW in mainland Europe. Surely you understand that Bognor Motors, as a responsible garage have a duty of care to advise in line with what manufacturers recommend, and if we start wrongly advising customers to ignore the guidelines of VW UK for their cambelt changes or anything else on their vehicles, and then there is an issue, it will fall at our feet for responsibility. I agreed above that it doesn't make sense, however for any warranty and for what we have seen in some cases, the changes need to be adhered to. Over the years with many manufacturers there used to be a time when the inspection of the cambelts was part of an annual service, however in some cases (Vauxhall spring to mind) , to inspect the belt properly there was so much work involved, that as you were there and already paying a labour charge you may as well replace it at the same time.
Comparing a timing belt that is changed on a time/mileage basis to brake pads and clutches that are friction parts that are changed when worn out isn't a fair comparison, especially as we have seen at the UK stated replacement interval we have seen issues with he condition of the belt or associated parts (See our BMVS thread ref the idler pulley nearly coming off - That engine would have gone bang if left much longer than when we did it) . Brake pads are inspected on every service and advised on their wear, or can be felt as they wear down by the user. Clutches can't be inspected easily, so driving feel(slipping/juddering) initially dictates when and if these are worn, and the need to inspect - Both of these cases are worn by driver input and driving habits.
For fear of repeating myself, which I'm not going to again after this comment, we as a business will advise in line with what VW UK recommend. At the end of the day its your vehicle, and ultimately you do what you want. If a customer of ours declines our advise on this or any matter during a service or inspection, we will always note it on their invoice. Its due diligence for us.