Nemophora degeerella, a longhorn moth
Volucella pellucens, large, common hoverfly
Volucella bombylans, amazing hoverfly that mimics Bombus lapidarius - the same species has another form that mimics B. hortorum - the larvae feed in the nests of the host bee.
Merodon equestris, also known as the Narcissus Fly, another hoverfly
Cephus pygmeus, a sawfly and pest of wheat - this is about 1cm long but check out the ultra-tiny hymenoptera sharing the cow parsley!
Canon Powershot SX10