I have recently finished Management Basics for Information Professionals by Edward Evans and Camilla Alire. It is an excellent overview of management as it pertains to libraries. It references both the library and the general management literature. It is very American, which is mostly not important, although American laws are different from the UK. Interesting ideas that I picked up is that delegating gets more done, and that making jobs more interesting can motivate people. A good read and an essential reference work for librarians, as the authors point out: some management is unavoidable.