The heartbroken family of a British diving instructor killed by a shark in Australia have paid an emotional tribute to the "wonderful human being".
Simon Nellist, 35, died after being attacked by a 15ft great white on Wednesday off the coast of Little Bay in Sydney.
It was the first shark fatality for nearly 60 years in the area and onlookers watched from the beach in horror as the predator pounced from under the water.
