The Guardian reported
Britain has a new species of butterfly: the southern small white has continued its rapid colonisation of northern Europe by flying across the North Sea.
The species looks very similar to the native small, large and green-veined whites but two individuals spotted in County Durham and Suffolk this summer have been verified as Pieris mannii, which was once confined to southern Europe.
Read more and see photo at ‘Top marks’ for sharp-eyed snappers as UK nets new butterfly species | Butterflies | The Guardian
Natural History Wanderings 
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