I could not definitely identify the viper's bugloss mason bee even if I saw one – there are nearly 250 species of solitary bees in the UK and I can recognise only a few common ones – but I did see some other cool insects. What's more, I was able to identify most of them using the field guides in the park library.
Exhibit A: the common red soldier beetle. This insect is often seen copulating on hogweed, hence its amusing nickname, the hogweed bonking beetle. Here is a nonconformist pair, mating not on hogweed but on hemp agrimony.
Exhibit B: common blue damselflies. Before mating, the male (blue) uses claspers at the tip of his abdomen to grasp the female behind her head to prevent other males from dislodging him. My friend Lalanti taught me how to tell apart damselflies and dragonflies: when resting, damselflies hold their wings parallel to their abdomen, while dragonflies hold them at right angles.
Exhibit C: a thick jawed orb weaver spider which has ensnared a solitary bee slightly larger than itself.