Phyllonorycter tristrigella mines on Wych elm.

                   After only succeeding with hearing the Yellow browed warbler at
                   Kenfig yesterday, I decided to walk the east pool shore and head
                   back to the car park via the path from the north pool up to the main
                   road. There is a stand of Wych elm near the top of the path just
                   behind the bus shelter and a search for leaf mines produced this
                   one, which pretty much matches the photos on UKmoths and the
                   descriptions in the guides.