Admiral-class carrier conversions reshape Washington

How would early conversions of Courageous, Glorious, and an Admiral-class hull affect the Fleet Air Arm and Washington Naval Treaty?

Britain would arrive at the treaty with several very large carriers already built or converting, likely forcing grandfathering and a larger carrier-tonnage allowance.

The counterfactual converts Courageous and Glorious in 1919, followed by an Admiral-class hull completed as a carrier before the Washington conference. Conversions along Eagle's lines would give the fleet more aircraft capacity than the later, more economical arrangements. An Admiral-class hull might still displace roughly 37,000 to 38,000 tons after losing its heavy guns and some armour. Further conversions would probably already be under way, giving Britain reason to seek a larger carrier allowance. Grandfathering the completed ship, as happened with Hood in the battleship settlement, is another proposed way of accommodating it.