Although there are a lot of black and yellow wasp species, I am pretty sure this is Ancistrocerus gazella, commonest species in our part of England but new to the garden list. Lots of nymphal Shieldbugs - here the Woundwort Shieldbug and dozens of Flower spiders around the garden - they seem to like the pink flowers or, perhaps, they are more visible there. The Yellow Rod takes over from Knapweed as the most visited flowers in the garden.
