ADVENT DAY 19: It's D-Day for first class postage!

Tom has packed in the bores of science and has been working his socks off as a postman.  Instead of working out what gives things mass, he has been tackling a mass of parcels for the girls and boys of the UK. The only laser Tom wants to see is the one in his pocket that tracks recorded delivery.

So check out Tom celebrating D-day and the final full sack of Christmas postage to tackle.

Merry Christmas!