White-beaked Dolphin (I think) RIP

A rather sad event today was the finding of (what I think is) a dead White-beaked Dolphin on the beach at Saltwick. This is a species I've not seen alive, having looked the wrong way on a couple of occasions or been distracted by Wilson's Petrels or other feathery things.

The dolphin did not appear damaged just dead. I guess it might have stranded itself but more likely it's just died out at sea and got washed in. I don't think this species should really be in the North Sea at this time of year?