A pair of 24-spot ladybirds, Subcoccinella vigintiquatuorpunctata = Subcoccinella 24-punctata (Coleoptera: Coccinellidae). Unlike most other ladybird beetles, which prey upon aphids, these are vegetarian. At 3-4mm long these are distinctively smaller than the commoner Coccinella septempunctata and Harmonia axyridis (6-8mm long).
This is another one that I had seen ten minutes earlier:
Photos taken in the field below Chazey Wood, near Caversham, UK, on 2012-05-13.