Cobalt Crust Terana caerulea (coerulea in a lot of databases) - 8 locations found in less than 2 hours Brynna Woods NR, Glamorgan. Out of 325 records on ADERYN (all Wales LERC) database about 80pct in Glamorgan VC41. Not sure if VC41 is really such a hot spot or because we have good dedicated recorders?
Photos 1. on Garden Privet 2. on Oak 3. on Hazel. Also on Ivy today - it is not picky on substrate