The Field Grasshopper is a common, widespread species throughout Britain (see here for details), but this is the first time I've managed to see and identify one at Linacre.
We also spotted this beauty, a Noon Fly (Mesembrina meridiana) Again, this is a common species, but my first record. More details here.
The shieldbugs were all new to me at Linacre. Here's the first one, the Common Green Shieldbug. The top photo shows the adult, and the bottom photo shows a "fourth instar" nymph. Apparently, young shieldbugs moult several times before they become adults and each time they moult, they look different. See here for pictures of the different moults.
Adult Green Shieldbug
Young Green Shieldbug
Another species we saw was the Bronze Shieldbug. This time I'm sure this individual is a "final instar nymph". See here for more images.
The final shieldbug was a Hairy Shieldbug, another common and widespread species, but my first at Linacre. See here for more details.
The hoverflies were a Drone Fly species (Eristalsis pertinax), a Helophilus species, most likely Helophilus pendulus and a Syrphus species. The Syrphus species is particularly tricky to identify as there are 3 very similar species that can only be separated under good magnification. Unfortunately I didn't have a hand lens with me and the hoverfly wouldn't sit still!