Mooched around Bray Gravel pits (as recommended in ‘Where to watch birds in Berkshire”). Hattie thought grebe were coots so no tea for her. Also saw a heron on a house roof. Anyway, number 23 was left at the entrance to the Berks, Bucks and Oxon Wildlife Trust  (BBOWT) reserve. It was quite late and I suspect she may have spent the night outdoors, but she won’t flap.