I've also seen what was probably the same aircraft in similar colours in that area a few months back. I was surprised to see it but it was definitely a Huey type, I have flown them a few times so was able to recognise it well enough.
It was carrying out USL work on the hills, moving builders bags of something (the white 1 cubic metre type). I assumed it was for footpath renewal work but couldn't see precisely from the Woodhead Pass road.
Approx location when I saw it was N53 29.5, W 01 47.8