*Some blackcaps overwinter in the UK, mainly in the south, but I haven't seen one here since last summer. The maps from the BTO Bird Atlas show relative abundance in summer and in winter.
And here is a bonus bird, another one with a black head. This is not a summer visitor but is here all the year round. I always get a visit from a male reed bunting (Emberiza schoeniclus) in April. It has probably run short of food and comes from the reed beds in the nature reserve a mile away to my bird feeders. I have never seen a female in the garden.