From the Port of London Authority Website:
An astounding 708 seals have been spotted in the Thames Estuary in the first ever count by air, land and sea, carried out by the Zoological Society of London (ZSL).
Conservationists and volunteers jumped into boats to help tally the number of grey and harbour seals along the Thames, whilst others took to the air for a bird?s eye view of the coast, or stuck to solid ground to investigate small creeks and rivers.