It'll be warm for most today with a mixture of cloud and sunshine this afternoon.
There'll be highs of 23-24C possible in places but it'll feel cooler along the coasts in a sea breeze.
Later, any cloud will melt away to leave a perfect evening with late sunshine before dusk.
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Sir John rejected the PM's Brexit vision as "unreal and over-optimistic" as he accused negotiators of "souring" the atmosphere for talks.
Lively start to the week
White House budget officials outlined the information during a telephone call with reporters given on condition of anonymity.