Pale flattened moss.
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Much appreciated. One thing I have learned is that when you think something does not seem right it is usually isn't!
However, I don't think I would have hit on this on my own.
If you’re not already using it I recommend the British Bryological Society’s field guide
I think the flattened appearance and pale green colour are also for me quite distinctive.
Lat/Lng: 57.4, -4.2
OS grid ref: NH7040