Keeping track on Santa

Now with just 4 sleeps to go until the busiest night of the year, Santa needs to make sure he's ready to criss-cross the world on Christmas Eve. And that means the fella in red has to do a few test runs.

And where better to track Santa as he prepares for travelling at the speed of light than RAF Fylingdales in North Yorkshire..whose primary purpose is to give the British and US governments warning of an impending ballistic missile attack.

Kate Walby went to see if their technology could pick up anything "incoming" from Lapland..