Legring with a two alpha-numeric code.
note 1 : all birds ringed in Britain & Ireland.
note 2 : used colours are : light-green (lime), black, amber, green, yellow, orange, red, white and blue.
note 3 : up to 2004 a different colour each year. 2005-2011, Blue in Wales and White in England except for 6 chicks in Sussex in 2011 (yellow and orange).
note 4 : from 2012 white with 2 black letters used for all birds as c-rings sometimes dificult to read on camera. White with black letters very clear.
note 5 :