The countryside is full of blossom. This track near Pirton in Hertfordshire is marked on some maps as 'Green Lane' and on others as 'Wood Lane'. What remains of the ancient hedgerow puts on a beautiful display in spring. At first glance I thought this might be more Blackthorn [see last entry] but no thorns so probably Cherry Plum (Prunus cerasifera)?
I saw many honeybees on the blossom and this critter which looks to be a bee fly rather than an actual bee. The Bombyliidae are sometimes referred to as bee mimics.
Unlike a bee it hovers over the flowers to forage. Note the long tongue!