Found half a dozen larvae last year and gave them various bits of rotting tree bark/cardboard to pupate on (and with!). The first adult emerged last night or this morning - certainly a first for me. Makes up for some of this months poor numbers.
On another matter, am I likely to see Small Waved Umber near Chesham/Berkhamsted/Tring? Feel it ought to be here on chalk, but never seen it.