I took these images of this Pomarine Skua off St. Ives Island last week. I posted a single image of this bird on the 5th Nov but several people have asked to see further images. The age of this bird is probably a second year. Juveniles and first years would show extensive barring on the underwing and flanks. The only hint of any barring is limited on the upper tail coverts, flanks and mantle.
The image below shows the bird's deep chest and heavy looking structure.