Emperor - the male seen here showing the very distinctive black dorsal line running down the abdomen and the yellow costa (leading vein of the wings)
Southern Hawker showing the diagnostic continuous bands of colour toward the end of the abdomen
And Common Darter with the light stripe of colour on the legs and the antehumeral stripes (shoulder stripes) just visible. Interestingly no records have come in yet of Ruddy Darter which typically flies earlier in the season than Common Darter. Stephen recently saw this species just over the border in Cheshire, so it will be out and about just waiting for us to spot it.....