Didcot Landfill Caspian Gull 27th February

I've received the details of the colour-ringed Caspian Gull seen at Didcot on Saturday:
It was ringed as a nestling at Paczkow in south-west Poland on 25th May 2012 making the bird a 4th winter.
It was seen in Norfolk when it was 50 days old (14th July 2012) and at Albert Village, Leicestershire on 6th August 2015.