A Chiffchaff (non-tristis) was in Bragar village today. Although not infrequent in the southern isles, this species seems to be rare in Lewis and Harris in winter. I've never seen one before, and I could find only one Dec-Feb record in local bird reports for 1997-2013.
Other birds that are scarce up here in winter include Skylark (1 at Loch Ordais today) and Twite (10 on the shore nearby). Also, a drake Gadwall was on Loch Ordais, with the Mute Swan still present.