kmike

Good question

The key feature to look for is whether the under tail coverts (UTC) are dark with pale edges (Verditer) or all-pale (Pale Blue). Your picture shows part of the UTCs and these look to me to be completely pale.

Pale Blue is supposed to be longer-billed (hard to tell at this angle) and have a greyer belly (looks like it)

I'd be interested in others' opinions
Cheers
Mike