This pair were sat tight on bare (as far as I could tell)rock about 10m up a 30m cliff. Could they be nesting/sitting on eggs?
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'They will not be nesting yet - not until May will the eggs appear - but they do sit around on nest ledges pretty well all through the winter. Some will not be breeding this year either, as they take 5y+ after flying to get to maturity, and may live for several decades thereafter.' quote from Syrphus on my Fulmar upload.
Lat/Lng: 51.4186, -3.5761
OS grid ref: SS904700