The fossilised tooth of a prehistoric crocodile has been recorded as the largest of its kind found in the UK.  The 2in (5.5cm) tooth was dredged from the seabed near Chesil Beach, Dorset.  It belonged to an ancient relative of modern crocodiles, known as Dakosaurus maximus. Researchers from the the University of Edinburgh and curators from the Natural History Museum identified it after it was bought at an online auction by a fossil collector about a year ago.