Acrocercops brongniardella

Local, but common where it occurs.  Recorded as an adult to light and as a leaf-miner on oaks, especially (but not exclusively) on holm oak.  Most common in seaside towns where the larger gardens have high concentrations of holm oak, and in similar situations around Bath and Bristol.  Also on deciduous oaks on old coal-tips around Radstock and Midsomer Norton.