Nice picture of the butterflies, Hugo.
My garden has been visited by hummingbird hawk moths during the last few days, sometimes two moths at once. They zoom in, hover about the red valerian sucking up the nectar and then zoom off again. They're big, powerful moths and very fast flying - their wings make a low humming sound and you can feel the air move if they fly close by.
By following them about the garden I've finally managed to get a couple of reasonable shots. Has anyone else seen them?