Funny things on Oak

Late October leaf-mining on Oaks at Dingestow produced two larval signs of interest: the larval mines of Ectoedemia subbimaculella with slits that frass is ejected through, and frass-covered tubes on the underside of leaves which had me totally baffled but which were IDed as Gypsonoma dealbana by Billy Dykes.

The blotch mines of Ectoedemia subbimaculella have a slit at one end, from which the larva ejects frass.

This is unique to this species, which is a notably late feeder, with larvae occupying the mines well into November,

often continuing to feed in 'green islands' after the leaves have dropped. 
Earlier in the month, the similar (but slitless) mines of E. albifasciella were commonplace.

The common Tortricid Gypsonoma dealbana makes a silk tube, covered with frass, on the underside of Oak leaves.  Something new I learned today!