Hi, Turnstone in winter plumage, granted bad lighting and long shot but stumpy beak and legs. Flock of 6.
Not sure on rarity but Amber status, and 1st for me. Confirmed, thanks.
Other: chiffchaff, peregrine, buzzard, kestrel, stonechat, raven, green wp, shelduck, rock pipit, little grebe, swan, possible carrion crow with albino wings etc
HD Link: Turnstone
Glamorgan Bird Club 
It is indeed a (Ruddy) Turnstone – congrats on them being a first for you! Coincidently, I saw my first ones there back in 1980!