More than 700 seals have been recorded in the Thames Estuary.
In the first ever count by air, land and sea, the Zoological Society of London found hundreds of grey and harbour seals along the Thames and in small creeks and rivers.
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The South East will enjoy the best of the weather and along with Paris will be the hottest place in Europe.
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Jay Gittens, 44, initially thought the enormous 'shadow' below the surface was a whale shark or humpback whale.