It's always good fun to try and age the birds that come to the feeders. This male Greenfinch was particularly interesting.
At first glance, it looks like an adult male: all the greater coverts are adult-type; the tail feathers are broad and round (adult-type); the tertials are grey and square (adult type); the primaries are dark and blackish with a nice pale fringe. Look at the primaries again, though; in particular, the longest visible primary. It's a retained juvenile primary. Further clues to the ageing came in the secondaries — though not terribly clear in these photos, you can just about make out that S6 (innermost) on both wings is new, that S1 (outermost) on both wings is new and appears to still be growing(!), and the secondaries in between (S2–5) are browner (rather than grey-fringed) juvenile secondaries.
‘Our’ female Blackcap was also still in the garden, stuffing herself with sunflower hearts.