Yes, but I'm sure you remember that the bird was correctly identified by the finder much earlier in the day, however a group of experts who shall be nameless doubted their skills and didn't go to check till much later. News could have been out much earlier, and the fact that the nameless group...
Sometimes it is both, sometimes one or the other, sometimes you are exactly right!
It's when you are right and the prospect looks expensive (in relation to your resources) or difficult (multi-stage travel, island-hopping etc) that you start making the hard decisions about whether to go or not...
I came up with some more:
Should have gone:
Eastern Yellow Wagtail - could've, but couldn't raise the enthusiasm....
Went a day late:
Amur Falcon (twice!)
Lesser Short-toed Lark
Looking down your list I got all of those (not always your individual) and having got the Glaucous-winged Gull, I took Maz to see the Cornwall stuff the following weekend and had one of the best days ever with Gyrfalcon, Dusky Warbler, White-billed Diver, Spotted Sandpiper, alleged halimodendri...