Hoverflies. (Episyrphus balteatus)
Here is a picture of two Hoverflies enjoying a rest on a Wild teasel (Dipsacus fullonum).
Taken using a Sigma 105mm Macro lens with a small touch of fill flash to lift the detail on their gossamer wings.
This is a migrant species of Hoverfly, which is very common throughout Britain from April to November.