This michahellis pphotographed by Dirk Van Gansberghe in Rome in May 2015 shows the same type of scaps as "my bird":
https://fbcdn-sphotos-a-a.akamaihd.net/ ... 6963_o.jpg
https://scontent.xx.fbcdn.net/hphotos-x ... 3445_o.jpg
You have to be a member of the facebook group "European Gulls" to see the pics, I think:
https://www.facebook.com/groups/europeangulls/
Best wishes, Rune