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The report said shark species including tope, starry smooth hound and spurdog live in the Thames and the there are more than 100 species of fish in the 215-mile long river.

Rich Thomson was surfing off the Devon coast when what was thought to have been a smooth hound shark - three feet long - bit his thigh.

"British waters are home to a wide diversity of sharks with a number of coastal species such as smooth hound, tope and cat sharks often reported by beachgoers and water users," she said.

Marc Dando, wildlife publisher and illustrator, said he thought the shark was probably a smooth hound.

No other incident of this type has happened to surfers in UK waters, according to experts who said the shark could have been a smooth hound.