Confidence: It's likely to be this, but I can't be certain.
Notes: It looks like a good candidate for this species. It is very variable in colour. The dark throat is mentioned by MarLIN as a feature of the species. Their examples are pale but dark ones like above are the norm on the shores where I look. See the MarLIN page on it here: http://www.marlin.ac.uk/speciesinformation.php?speciesID=3715#