Found a slow worm in the garden too, it's only a little garden but I have gardened it organically for 27 years so we do get quite a bit of wildlife passing through.
Don't read this if you're a bit squeamish about big beetles! Every year at the end of May the stag beetles come out of their logs they have been pupating in, in our garden and fly around like kami kazi pilots for one or two evenings before the garden is littered with dead bodies of the afore mentioned beetles. It's all a bit gruesome but I like the fact that they are rarer now, but we still have them. We don't sit out in the garden on those evenings because they seem to have absolutely no sense of direction and clumsily bump into things constantly! Some are really big, the ones in the photo were average sized, about 1 1/2 " Sorry the picture isn't brilliant but you get the idea.