Just goes to confirm my opinion that DTV is a crock of ordure and, the more people that start using it, the worse the problem will be.
I have a freeview box that, every time I turn it on (rarely) insists that "New channels have been detected on the flow" (they haven't) and then insists on going through a lengthy tuning procedure before it will let me watch anything (which will freeze and pixellate anyway). There is no option to turn that 'feature' off either.
When we go to DTV only, I suspect I will just dump TV viewing altogether.