Crossbills of any description seem few and far between at the moment here. I've had some Commons in Spruce but not many cones on the Scots Pine. Not much help really but outside of the breeding season they range widely and always just a matter of luck.
A couple days ago I was in the hills near Cromdale, not far from Grantown and Abernethy forest, and saw on several occasions, a flock of crossbills. I have an app to identify bird sounds on the field, which helps a lot in bird ID (and it draws sonograms). I saw them also for longer period of times as they were eating seeds of pine cones, and they were clearly crossbills, and then I heard the different audio calls here (https://www.the-soc.org.uk/content/...ntification-of-scottish-and-parrot-crossbills) and the calls were a perfect match for Scottish crossbills (what I heard was a type C call).
But I am aware that the genetic difference is quite small between common and scottish crossbills.