I'm listening to a digital radio broadcast over the internet. Downstairs I can here the same programme on an analogue radio. There is a clear time difference, very noticeable when the time pips came on for the news. Which version of the time should I set I set my clock to - digital or analogue? My watch is radio controlled by the National Physics Laboratory - which time is that set to?

My digital TV has a menu containing a guide to several days' worth of forthcoming programmes on each channel. When I first bring up the guide, there are lots of blanks in the schedule. Over the next few minutes these gaps are gradually filled, seemingly at random. How does this happen and what determines the order in which the holes in the schedule are filled?

Alex Andrews, Newton Abbott, Devon, UK