They have been leaving the nest sights in the last couple of weeks, as they take their young out to sea to fatten up.
A small percentage of Guillemots have a white ring around the eye and a white line down towards the nape. These are Bridled Guillemots. These birds are still of the same race and not classed as a subspecies. The slight variation is quite striking though.
The Bridled variety.
A short phone video just to give you an idea of the noise on Staple Island.