If you have little ones and they are up early on Xmas morning (and what child isn’t? ) and the weather is clear then point them towards the heavens at 5:55.
With a couple of minutes’ patience scanning the sky to the south and southwest and a little luck they’ll see Santa’s sleigh heading home!
That’s the London time. Birmingham is a couple of minutes afterwards and Cornwall two more minutes later.
(it is, of course, the International Space Station)