Eurycephalochelys sp. a trionychid turtle (a new species for Sheppey)?
 
Danny Hogben collection
This unique specimen was found by Danny Hogben at the base of the beach between Eastchurch and Minster, just East of Ashcroft holiday park
 
 

Moody & Walker first described Eurycephalochelys fowleri in 1970 from the Bracklesham Series (Lower Eocene) to read/download the paper, check link below