Cornwall MP Ben Maguire says there is a lack of consultation by the Marine Management Organisation.

Activities including cooking demonstrations and snorkelling will feature during the event.

Eight beach sites will be surveyed as part of two "citizen science" projects into climate change.

They say it covers an area equivalent to 900 rugby pitches off the coast of Cornwall.

Campaigners who were concerned about the effect on sealife say a "black cloud" has been lifted.

Biome Algae and Carbon Sea Garden have put in applications to harvest sugar kelp in Gerrans Bay.

The seaweed on Weymouth beach had attracted complaints - but it is not being moved for that reason.

Drone images show the seaweed washed up by winds on the southern section of Weymouth Beach in Dorset.