A post-work visit to Slade Woods came up trumps. A White Admiral butterfly provided a bit of interest whilst staking out a small stand of cherry trees; half an hour later a Hawfinch (149) flew out (God knows where it had been sitting) and, after another half hour of mooching around, a couple of Spotted Flycatchers (150!) were bagged. Also heard Willow Tit (would have been 151) but the little bleeder evaporated before I could slap eyes on it.
One hundred and fifty and plenty of 'tarts' still required.