Cabinet Secretary Sir Jeremy Heywood has rejected Labour calls for an inquiry into alleged breaches of the ministerial code relating to lobbyist Lynton Crosby's engagement as elections adviser to the Conservative Party.
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Wintry scenes across the UK this late in April have not been seen since the mid-1980s.
The Labour leader will also announce an inquiry into anti-semitism and other forms of racism to be chaired by Shami Chakrabarti.
A switch in the wind direction will mean the unseasonably bitterly cold air of the last few days finally gives way.