Paleontologist Steve Etches told theBBC: Its one of the best fossils Ive ever worked on.
What makes it unique is its complete.
Worldwide, theres hardly any specimens ever found to that level of detail.
Moreover, each tooth is marked with fine ridges, the outlet described.
Pliosaurs could be considered to be the ultimate prehistoric killing machine.
I have no doubt that this was sort of like an underwater T. rex, Andre added.
Moreover, fossil evidence has reportedly revealed that it would have even feasted on other passing pliosaurs.
The unlikely discovery was reportedly too heavy to carry, prompting Phil to fetch Steve.
Subsequently, the friends rigged a makeshift stretcher to take the fossil fragment to safety.
Thanks to a drone, the rest of the body was also found after a likely location was pinpointed.
Nevertheless, the only way to excavate the fossil was to reportedly abseil down from the top.
Paleobiologist Professor Emily Rayfield has also examined the large circular openings at the rear of the head.
A powerful bite means youre also able to crunch through tissue and bone quite effectively.
Its one of the best fossils Ive ever worked on.
And it really should come out because its in a very rapidly eroding environment.
This part of the cliff line is going back by feet a year.
And it wont be very long before the rest of the pliosaur drops out and gets lost.
Its a once-in-a-lifetime opportunity.
The program will air on BBC One and iPlayer at 20:00 on 1 January.
Dinosaur enthusiasts were delighted by the news of the pliosaur skull discovery
