In detail, perhaps, but in outline they settled quite quickly;sergeante wrote:The British, on the other hand, had several cruiser models that were not serial developments of the same chassis (Mk IV, Covenanter, Crusader, Cromwell), and likewise several infantry tanks (Matilda, Valentine, Churchill). WRT the specifiers not getting what they wanted, I think history is pretty clear that the specifiers were unclear about what they should want, leading to constant redrafting of specifications as experience proved their pre-war and early war suppositions wrong.
Cruisers; 30mm armour frontally, 2pdr / 3" (or 3.7") plus MG, fast, especially across (decent) country.
Is; Heavy armour (70mm frontally for Matilda, less on Valentine), 2pdr / 3" (or 3.7") plus MG, not fast but good in mud or on slopes.
Up until Crusader I IMO the different Cruisers were various attempts to get the above with varying degrees of success or failure. Cromwell was from a later time when the AT threat had moved on a bit; PzIII and IV got uparmoured, Crusader got replaced.
Matilda was the official answer to the I tank outline, Valentine a private venture; Churchill again from a later time.