I bought the 7th edition last year and I hardly used it to be honest, just use a libary one if possible, if your gonna buy a law book though, your always better off getting the newest edition as even the new editions are pretty much out of date, the law changes that much. With some books they have an internet site where you can go for updated information though, in fact just glancing up at my slapper and kelly book, it says it has a companion website on the spine.