Unknown bird 3

Unknown bird 3

Observation - Unknown bird 3 - UK and Ireland. Description: I do not recognize this bird, nor can I find anything like it in the books I have. I wonder if anyone can identify it? It looks like a sparrow but has a lot of white markings on head, back, wings and chest

I do not recognize this bird, nor can I find anything like it in the books I have. I wonder if anyone can identify it? It looks like a sparrow but has a lot of white markings on head, back, wings and chest