You really cannot go wrong buying a cinema book written by Allen Eyles. A comprehensive history, easy to read, with first class photographs that you will have problems in finding elsewhere. The Granadas were special and there are at least two jewels in their crown - Tooting and Woolwich - which are both well documented in this work. Like Allen's works relating to other cinema chains - Odeon 1 and 2, Gaumont, ABC, and I've probably missed some out - these are probably the best books on the subject you will find. Pity that it is likely that you will have to source a good used copy - but I recall that the Granada book was one of the easier ones to find at the time!