Ringing update,
I have just received a reply about the ringed common gull at prescot reservoirs seen on 5th Jan 2010.
It was rung on 10th july 2006 on the island of Amrum just off the north sea coast of Germany. It was then recorded each summer in 2007, 2008 and 2009 at Amrum and then finally by me at Prescot reservoirs in Jan 2010

Rung 10.7.06 at Amrum Germany
recorded 2.6.07 at Amrum Germany
recorded 6.6.08 at Amrum Germany
recorded 19. 5. 09 at Amrum Germany
recorded 5 .1.10 at Prescot reservoirs, UK