The chaffinch is the UK’s second commonest breeding bird, and is arguably the most colourful of the UK's finches. Its patterned plumage helps it to blend in when feeding on the ground and it becomes most obvious when it flies, revealing a flash of white on the wings and white outer tail feathers. It does not feed openly on bird feeders - it prefers to hop about under the bird table or under the hedge. You’ll usually hear chaffinches before you see them, with their loud song and varied calls.
(Info from wwww.rspb.org.uk)