Good news from Martin Albertini: He has confirmed that three moth leaf-mines I've found recently in Bucks are all new for the county:
Phyllonorycter comparella and Tischeria dodonaea have been already displayed here.
Phyllocnistis xenia hasn't until now: It leaves 'snail-trail'-like markings on the leaves of Grey and White Poplars.
These trails are elusive; when you hold them up to the light they disappear.
This leaf was from Denham Garden Village.