December Chiffchaff in the Figgate Park

I don't often see Chiffchaffs in the winter months up here in Edinburgh and when I do I am always hoping for a Siberian Chiffchaff rather than a Common Chiffchaff. Today's bird at Figgate Park did not call, but looks spot on for a Common. Despite a hint of a wingbar, the olive and yellow tones in the plumage combined with the bespectacled look and lack of jet black bare parts all combine to give the familiar look of the regular form. Wonder where this bird is from - a local breeder or a Continental bird?... Wherever it was an energetic little sprite rarely  still for more than a second.