Weatherday: 'This instrument shall be submitted forthwith by His Majesty's Government'

The day starts with freezing fog, and a fog warning continues through the day and coming night. If it lifts there's a possibility of sunny spells. It should remain dry.

The highest temperature will be around 4deg and then we're back down to freezing tonight. Any very light breeze will be from the north.

On this day in 1921 the Anglo Irish Treaty was signed giving Ireland self-governing dominion status within the British Empire and creating both the Irish Free State and the partition that formed Northern Ireland. It also led to the Irish Civil War.

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