I found three late instar Marsh Fritillary larvae in the top field at Caeau Ffos Fach, so it may be a little while before the adults are flying at the site.
It was heartening to see large numbers of Green-veined Whites, along with a few Orange-tips, flitting around the cuckooflowers - especially given how few butterflies were around in the spring of 2016. I also found a Pale Brindled Beauty larva on birch.
Afterwards I stopped briefly to check the Devil's-bit Scabious at a graveyard in nearby Cwmgwili, and found a nice plump Marsh Fritillary larva - a new site I think. A Heliozela was flying around a hedgerow oak - it was hyperactive and these were the best photos I could manage!