Update on my earlier post 'Anyone know a Coleopterist'. I saw the beetle in the garden again today and armed with the knowledge of spines on the tibiae as the key identifier I was able to identify it definitively as a Lesser Stag Beetle Dorcus parallelopipedus - it only had one spine!
Great Wall Addendum - Leopard Slugs (Limax maximus). An introduced species, thinking about making more of themselves. And what a process that is!
16 hours ago