Ben Carpenter has found a Wood Warbler in Barton Fields, Abingdon by the Thames (between Barton Lane and the river) at 7am.
"It was just a bit beyond Barton Fields along the Thames Path to the
east; at grid reference SU51299704 (at the end of the long straight part
of the path which is largely enclosed with hawthorn, blackthorn and
willows, and beside a ditch). Singing high in a willow on the right. Also present a Mandarin in the Thames."
No further sign by 9am though lots of common warblers singing including Garden Warbler. Also Cuckoo calling along the Thames