Defra has been working with the Animal Health and Vetinary Laboratories Agency to track cases of the Schmallenberg virus in the UK. Read more about the virus and its transmission on the Defra website.
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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.