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The basking sharks, which can grow up to 26ft long, have been spotted off beaches in many of the country's holiday hotspots.

As if that wasn't terrifying enough – thousands of jellyfish have also been spotted in the waves.

Ross Wheeler of AK Wildlife Cruises in Falmouth, Cornwall, captured incredible footage of the first sighting of a shark in UK waters.

"We had two basking sharks – our first for the season – thousands of barrel jellyfish, 11 common dolphin and five harbour porpoise" he said.

The South West has seen temperatures of 24C in the last week and Brits are on course to see one of the hottest Aprils on record.

The sizzling temperatures have heated sea water around the UK coastline, bringing the giant fish from deeper areas to swim about near popular beaches.

But the sighting isn't likely to mean a repeat of horrific scenes from 1975 thriller Jaws - the basking sharks are harmless but have been lured to the Cornish coastline earlier than normal.

They swim around with their gaping jaws open to swallow tiny plankton, their main food source.

Forecasters expect this month to be the hottest April in 100 years and odds on the UK hitting a new all-time record breaking 40C this year are the shortest they have ever been.