My main work of the day was helping Richard Lansdown with his survey of Thatch-moss (Leptodontium gemmascens) at Cosmeston Medieval Village. Richard found this UKBAP moss new for Wales a couple of weeks ago, on two areas of low-hanging thatch, but today's ladder survey revealed patches on 5 of the site's 10 buildings and suggests there's a thriving Welsh population of this species. I forgot my camera, but will post a couple of Richard's pics sooner or later. If anyone wants to see Thatch Moss, look on the southern roof of the southernmost of the three linked buildings (the Reeve's Cottage, http://www.valeofglamorgan.gov.uk/Documents/Enjoying/Visit%20the%20Vale/Places%20To%20Go/Parks%20and%20Gardens/cosmeston/Medieval%20village%20Map.pdf): it's at head height above the door as well as on the SE corner, where shaded and kept damp by the roadside hedge.
After my visit to Cosmeston I spent 30 rain-soaked minutes bashing ST16P, getting ca. 40 species, including Syntrichia latifolia, S. laevipila, S. papillosa, S. montana and S. ruralis, more Dialytrichia, and not a lot else!