At first I thought robberfly but going through the back of my mind was Therevidae ... too much browsing of the Soldierfly book. Thereva nobilitata it appears to be - and would be thus declared as species number 600!
|596||Pegomya solennis||A Flower Fly|
|597||Aphidecta obliterata||Larch Ladybird|
|598||Psilolechia lucida||A lichen|
|599||Palloptera quinquemaculata||A Pallopterid fly|
|600||Thereva nobilitata||A Stiletto Fly|