Something at the back of my mind says it's a Manx Shearwater. Don't know where that came from.....there are doubts that I even have a brain!!!! That's my guess anyway.
Albatross would have been my guess too !. But the one who thinks she has no brain is spot on, well done.
There is a Manx Shearwater that was born and ringed on Anglesey in 1958 and has bred every year since making it 51 years old, for the record the Fulmar was on Orkney and the Gannet was on Bass Rock.