Experts say that although an outbreak of the Schmallenberg virus would be bad news for livestock farmers, it is not nearly as bad as a bluetongue outbreak.
Schmallenberg only causes mild symptoms in adult livestock and affects less than a third of newborn animals.
Bluetongue spread to the UK from the Continent in 2007, and prompted an emergency response of widespread vaccination. There were fears it could have killed 25-30% of the country's sheep.
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A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.
A band of cloud and patchy rain is expected across Scotland and Northern Ireland, moving southeast as the day progresses.