As per Sam's comment in the previous post by Charles, the Campylopus subulatus site at Pontneddfechan is very different to the forest track sites. In addition to the Campylopus, there was a surprisingly rich assemblage of associates growing in the gritty deposits of the huge rock mass in the river (which presumably floods or is sprayed in full spate). These included Anomobryum julaceum (photo below), Blepharostoma trichophyllum and Lophozia excisa, though the latter looked a bit different to material I've seen previously, so I've attached a photo for comment in case I've made a mistake. Some male bracts with developing antheridia were evident, so I presume these are just sexually ripening shoots.
Another new species for me (if verified), growing on the same shaley dripping cliff on the Mellte where Bartramia ithyphylla is known, was what I'm pretty sure is Solenostoma sphaerocarpum (voucher retained). Paroicous with spherical perianths (one visible in image below) and bright green rounded leaves are some of the characters which point to this species. Features under the microscopic all conformed nicely too.