Bird was flushed with three Redwing from east side of plateau (less windy side). Bird was similar size (perhaps slightly larger) bird observed for perhaps 10 seconds in flight, bird flew east and over the ridge and not relocated. bird was wholly grey upperparts and alarm called as it went, I checked the alarm call straight away on my collins app on my phone and it was identical. I did send a message to Rob Fray that evening to advise him of the sighting just in case it was found again (subsequently found by someone else in same area on the 14th)