At the mere a few days back were a couple of colour-ringed Lesser Black-backed Gulls:
The first, with white lettering AU on a dark green ring, appears to have been ringed on Skomer so it hadn't travelled far.
The second, with black lettering 069:C on an orange ring, has been a little more adventurous with these details given by the ringer;
'Orange 069:C was ringed as a chick on the 1st July 2023 at the Copeland Bird Observatory on Old Lighthouse Island, off Co. Down, Northern Ireland (54.693501, -5.526227). This is its first resighting.'