According to Landcare Research, 24 species of birds, many invertebrates such as dragonflies, hornets, centipedes and spiders, as well as badgers. The site indicates the badger is the major predator in the U.K....
Our cat tried to eat an wasp once, the moron, and it was understandably stung on the lip. He looked shocked as you can imagine, and distressed, cue lots of comforting words and strokes etc. He doesn't go near them anymore, so he's learned his lesson. The cat is happy, the wasps are happy and nature works again.