Paddy Griffith is probably the authority on this topic. His work, Battle Tactics of the Western Front: The British Army's Art of Attack, 1916-18, is a thorough exploration of British infantry tactics during the latter years of the war.

I would also highly recommend Firepower: The British Army Weapons and Theories of War, 1904-1945 by Shelford Bidwell and Dominick Graham. Firepower is more directed towards the development and utilisation of weapons systems but the discussion of infantry tactics is integral to understanding how advancements in the use of new and exisiting weapons came about.

In addition to what's been said above, a decent English-language coverage of the German side is Gundmundson, Stormtroop Tactics.