Done it again! Found the remains of another pupal case in the wild. Spotted one of last year's leaves spinning round on the gentle breeze of eve, or whatever the poet called it, high up in a large old sallow (a broader leaved x reichardtii hybrid). The leaf was attached only by silk. Sure enough, the basal part of a pupal case was evident.
This drama took place on the south slope of Toys Hill, near Westerham in NW Kent. This is not the first record for here as the local NT warden was assaulted by a male in his garage nearby at Emmets back in early July 2009. He still carries the bruises.