My camera was tricked by the light/colours etc of the location, and I thought at the time that they were something unusual, but not now with some post tweaking.
1. Dunnock I now think, but seemed a lot blacker to look at even with binoculars.
2/3. Female Yellowhammer? I’ve been testing a phone app though, and it came up with Cirl Bunting (which wouldn’t be up in Scotland)!
4. An anxious looking juvenile Greenfinch?