David Fletcher is one of the best known and most well respected researchers regarding British armor history. His two volume Great Tank Scandal set could be considered essential reading for anyone interested in WW2 British tanks. He has authored many of the Osprey New Vanguard series books, too many to list here.
Great Tank Scandal (British Armour in the Second World War) (Part 1)
The Universal Tank: British Armour in the Second World War (Pt.2)
Great War Tank: 1915-1945 (all models) (Owners’ Workshop Manual)
Tanks and Trenches: First Hand Accounts of Tank Warfare in the First World War
Armoured Fighting Vehicles of the World: AFVs of World War One
Mr. Churchill’s Tank: The British Infantry Tank Mark IV
Tiger Tank Manual: Panzerkampfwagen VI Tiger 1 Ausf.E (SdKfz 181) Model
Tank and AFV News 