Yes a poor year for many species, John. I've only seen a couple and haven't taken a decent photo yet. Same goes for the Holly Blue.
You have managed your exposure on the yellow very well. It may be a common flower, but I always struggle to photograph them.
Thanks Geoff. I have found with the Nikon cameras I have owned that in contrasty conditions, dialling in some negative compensation helps. It's a Nikon thing I think. This may have helped here.
It occurs with most cameras, I frequently shoot insects with around -1 exposure compensation. The skill is knowing when and how much compensation to apply.