Managed to catch up with the RCS at Holyhead on Tuesday morning. Had to wait for ~ an hour for the bird to appear on the playing field off Bryn Glas Road. It is a bit uncomfortable birding there, with it being a residential area. Mind you, at least the playing field was empty (other than RCS, Starlings and a couple of Herring Gulls) - might be even more of an uncomfortable place to be walking around with optics at the weekend!
Single Chiffchaff in the marshy area at Soldier's point, with Grey Wagtail and Water Rail also. There is an interesting article on wintering Chiffchaff at sewage works (plus 2 YBWs) on the BTO website at: http://btoringing.blogspot.com/2012/02/its-all-about-sewage.html Only a short article and worth a read if you have a spare moment.