Early Bear Hoverfly Criorhina ranunculi
The face shape helps identify the genus and this dark species has distinctive arched hind femora.
Early Bear Hoverfly Criorhina ranunculi, Dillington Carr (Norfolk, UK), 11th April 2022
The next one (taken a few minutes after the last and in the same area) showed a more orange tail colour to the previous one, so is presumably mimicing a different species of bee.
Early Bear Hoverfly Criorhina ranunculi, Dillington Carr (Norfolk, UK), 11th April 2022