This day last year was one of the quiet days between some really rough weather. Huge waves had been shoving all kinds of things up to the tops of the beaches.
This lump of whitish jelly should have been swimming about in the ocean, instead, it was lying here upside-down and dead. The barrel jellyfish is the largest of these creatures to inhabit British seas. It can reach a diameter of 90cm (3 feet) and weigh up to 35 kg (80 pounds), though 90% of that is water.
Like many 'giants' of the sea, they feed on plankton. Like other jellyfish, they do have a sting, but it is so weak as to be harmless to humans.
More information here