Dr David Kirrage from Public Health England says the risk that any child has caught an infection is "negligible", and they and Moreton School in Wolverhampton are working to reassure parents, after 20 pupils were jabbed with a diabetic testing needle.
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The 23-year-old suspect was held as he tried to board a ferry in Dover overnight.
Any early mist and fog will soon clear, with unbroken sunshine for most. With light winds, it will be another very warm day.
Dry and often sunny with mist, low cloud and fog largely clearing back to coasts through the morning.