Feather-moss - Homalothecium sericeum
Also known as Silky Wall moss
Many thanks to Kay Newbury at Reading University for the identification only of this Moss species - Homalothecium sericeum.
Found on rocks, brick walls, tree bark, concrete and other hard base-rich surfaces like limestone and Ash (Fraxinus excelsior) and Elder (Sambucus nigra). Leaves 2.5-3mm (0.1in) long, widest at the base tapering evenly to a finely pointed tip with weakly toothed margins. Spore capsules are fairly frequent, 2-3mm (0.08-1.1in) long, straight and cylindrical.