The Duchess of Cambridge was sent signals similar to those sent out by the enemy and interpreted at 'spy school' Bletchley Park during the Second World War.
Her grandmother Valerie Glassborow worked at the famous site as a civilian member of staff, probably a duty officer, with her twin sister Mary.
Kate's visit marked a year-long restoration project at the Buckinghamshire site.
More top news
By Sunday it should become drier with spells of winter sunshine but temperatures will still remain on the cool side.
There was no White Christmas but here's a look at the best Boxing Day snow scenes.
Actor Dustin Diamond allegedly stabbed a man in a bar in the US after getting into an argument on Christmas Day.