The Subalpine Warbler continued to show nicely...
...and some better wing and tail photos looked to confirm what we'd suspected earlier: Subalpine Warbler moult is very complicated as is clearly obvious in this photo that shows a wacky mix of old and new feathers - however, the presence of fresh outer primaries and alula is we think diagnostic of first-summer plumage as adults don't moult either in their pre-breeding moult...
...and more detail on the tail confirms the rather squared-off shape of the white on the penultimate feather which is just as it should be on a Western Subalpine © Mike Trew:
We popped up to see if we could record it this afternoon and whilst the windy conditions were far from ideal it did give a nice little burst of calling and several time broke into short bursts of subsong. The simple Lesser Whitethroat-like call does sound quite different to several recordings of Eastern Subalpines that we've listened to this evening:
