Sounds like a bunting or a lark, but can't recall one with a greenish blue cap, I'll ned to google it
Was it a Redstart I wonder?
This one below is a Fieldfare which is an overwinter bird in the uk, you may have seen a straggler, although the far north you don't see them very often. Your description sounds more like fieldfare because the greeny blue goes on down to its tail but the wings are brown, their is a gingery tint to the breast. It would be a little bigger than a Sparrow though, not far off the size of a starling.
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