NBN map of Pylaisia (yellow squares) with new site arrowed
Pylaisia is an eastern moss in Wales, with most colonies in Monmouthshire hedgerows where it tends to occupy a niche in the upper part of trimmed hedges, just below the level smashed by flailing each year. I have found it once in Glamorgan and three times in the Llandeilo area of Carmarthenshire, and I suspect it should be present in George's neck of the woods. It is most easily spotted in late winter because of its copious straight fruits, although it is easy to ignore as Homalothecium sericeum unless you have it in mind.
The photo is of a Monmouthshire hedgerow colony, not today's one (because I didn't have a camera with me).