Expect the unexpected

So, I'm merrily snapping away at Black-tailed Godwits, thinking about what I could blip today. Got home, looked at some shots and thought about using the Juvenille Turnstone that had obliged me with a half decent shot despite the howling gale. Then I spotted something that wasn't a Black-Tailed Godwit in the middle of the flock, flicked through a few more and found this one (bottom left of the shot).

Pretty sure its a Juvenille Dotterel, having been through my Collins guide, any other suggestions?