But ahead of Thursday's opening the environment Agency's North Wales Coast Environment Manager Alan Winstone said they would be closely monitoring activity.

BBC: Two cocklers on the estuary

In north Wales, the Environment Agency is investigating how hundreds of young brown trout and eels died in a stream near the Gaerwen abattoir on Anglesey.

BBC: News Online

Hayward said the environment in the North Sea is very different from that in the Gulf of Mexico.

CNN: BP's Hayward: Oil spill wasn't because of cost-cutting