Howdon Blogger John e mailed the ring details off on Saturday and received a reply the next day with full details.
Originally ringed at Palic Lake in northern Serbia as a breeding bird 26/05/2007.
Last sighted scavenging at Amble Harbour by J Hall and J. Atkinson 16/02/2013.
In between these dates the bird has commuted between Amble (autumn thro' winter) to Hungary (spring thro' summer) to almost the exact same coordintes with the exception of twice over here when sighted once each time at Seahouses and St. Marys' Island. In March 2008 it was reported by S. Sexton and on five other occasions by T Mason from 09 thro' 2011.
Thanks to Brian ( Northumbrian Birdung) for pointing me in the direction of this piece on the Northumberland and Tyneside Bird Clubs' website entitled "Some origins of Med. Gulls in Northumberland" by Steve Holliday with a collation of other sightings but including YJU7. You can locate it HERE