What Britain might build in response to the Alaska class

If the Alaska class entered service before World War II, what would the Royal Navy build in response?

Probably a fast, better-armored small capital ship with 12-inch guns, shaped by British battlecruiser experience rather than a direct Alaska copy.

An interwar Alaska-sized cruiser would require altered treaty rules, and Britain would seek an equivalent allowance. One option is numerous 9.2-inch guns, applying the same reasoning used when comparing 6-inch and 8-inch cruisers. The preference expressed here is for a fast small capital ship with 12-inch guns, drawing on a Courageous-like hull and Renown-like propulsion. There is disagreement over whether Britain would choose six guns and more armour or retain nine guns. Four twin turrets are rejected, while three triples and an all-forward arrangement are considered. The intended British role would shape the balance between armament and protection.