- White at the base of the primaries not extensive enough - not reaching beyond the primary coverts
- White on the outer tail feather broadest at the base (where it extends on to the inner web) and fizzling out at the tip - should be the other way round on Collared apparently
- Although it gave the impression of having quite cold grey upperparts I think that impression was influenced by the grey nape and rump - the mantle and scapulars look quite warm brown in the photos
- I don't think the upper tail-coverts don't look dark enough for Collared
- Tertial fringes possibly not narrow enough for Collared?
- Are the contrastingly warm gingery ear-coverts significant for its identification?
- How normal is it for Pied Flycatcher to show such an obvious pale greyish collar and pale rump?
- Do you agree it's just a Pied Flycatcher?
- What do female Pied x Collared hybrids look like?
And now just for fun, here are a couple of straightforward vagrant male Collared Flycatchers from my archives: