Unusual Winter Warblers?

During these cold winter days it is nice to think back to the summer full of the song of the Whitethroat, Willow Warbler and the reeling Grasshopper Warbler. Whilst most warblers migrate from Britain & Ireland to enjoy the warmth of their African wintering grounds, some migrate from Europe to spend the winter here. Blackcaps have been commented on before, here, here, and here, but they are not