Yesterday afternoon Chris counted 35 Med. Gulls on College Rocks including another ringed bird, White 320.
This had been ringed prior to fledging at a Dutch colony in June 2011. It was next seen from late November 2011 to early March 2012 on the island of Madeira, Portugal. In May 2012 it was seen in the Vendee region of south-west France before being seen by Elfin Lewis in August at Llanon.
The next sightings were again in south-west France during April 2014 before it moved north to the Pas de Calais in August (perhaps on its way to Ceredigion before flying south for the winter?).
It was back in south-west France and seen there in March 2015 and June 2016 and then in Aberystwyth yesterday.
I'm sure Chris will find some more!