We did manage to spot one caterpillar, but it was quite distant, and I only managed a very mediocre shot. Here's the original and a heavily cropped version.
Whilst searching for the caterpillars, we also saw several species of dragon and damselfly, namely Migrant and Brown Hawker, Blue-tailed Damselfly, Common and Ruddy Darter. The hawkers wouldn't sit still, so I couldn't get a photograph, but the Darters played ball, and I got a couple of decent photos.
First up the Common Darter. Here's a photo of an immature male that was soaking up the sun on the boardwalk. See the British Dragonfly Society's website here for more details about this species.
Walking back to the centre, we spotted a Speckled Bush-cricket - a new species for me. I think this is a youngster. More details here.