http://www.amazon.co.uk/Oxford-Guide-Style-Language-Reference/dp/0198691750
I bought this a long time ago in one volume with the Oxford Dictionary for Writers and Editors. I'm not sure, but I think I got it from that book club where you could buy 3 paperbacks for a fiver and never buy another book again. I've since upgraded to Oxford's New Hart's and an updated dictionary, but I never threw away the old copy. This turned out to be a good thing, because it (and the old edition of the dictionary) is one of the reference books specified by a possible new client.
I bought this a long time ago in one volume with the Oxford Dictionary for Writers and Editors. I'm not sure, but I think I got it from that book club where you could buy 3 paperbacks for a fiver and never buy another book again. I've since upgraded to Oxford's New Hart's and an updated dictionary, but I never threw away the old copy. This turned out to be a good thing, because it (and the old edition of the dictionary) is one of the reference books specified by a possible new client.