- British Mule Society aims to preserve and improve the standard of mules in general by breeding and to encourage the use, appreciation, well-being and protection of the mule. Welcome to the British Mule Society. We'll explain what a mule is, tell you about mules in Britain and show you some fine examples. Find out about events where you can see mules. And there's lots more - details in the site ...hamill.co.uk/british_mule_soc