It's R2JN, ringed as a chick in the Vendee (W France) in June 18. It was in Finisterre later that Summer, then disappeared for a year before turning up in Cornwall in Jan & Feb this year. It was on the Isle of Wight in March, Llanon in Ceredigion (where they have flocks of several hundred Meds) in July & August, & has been at Newport for the last c10days.
& many, many thanks to Richard for the blog, which has seriously widened the horizons of Pembs birding (& mine too).