Gemma Oliver, of Woodend School, asks :-

When the All Blacks play in Britain how is it known how many people in New Zealand watched the game live in the middle of the night?

Linda Beatson, of TVNZ, responded.

We ask a survey company, A B D McNair, to undertake surveys for them so they can see how many people are watching a particular programme.

The survey company asks 440 homes around the country to take part in the survey. The families plug a monitoring device into their television sets. Every time they watch a TV programme they push the button on this device to indicate what they are watching. This information is then sent to the survey company which collects it and estimates, on the basis of how many of the 440 families were watching TV, how many people in the country were watching that particular programme.