Leisure rangemaster electric 110-5432 replacement griddle element?

Please help. How do you remove the top hob griddle element of the leisure rangemaster 110-5432 electric. The old one has split and I have the new element, but no-one seems to know how to replace. The element(the one under the griddle hot plate ) seems to be on a hinge and when you take out the central screw it is still attached the hinge.
Any help appreciated thank you