A 1939 Royal Navy built from G3s and N3s

What if every British capital ship in 1939 were a G3 or N3 variant?

The scenario gives Britain a sudden advantage, with rival reactions and a possible American funding argument explored in response.

The scenario replaces Britain's capital ships in 1939 with G3 or N3 variants according to their type. An N3 battle line with nine 18-inch guns per ship would sharply alter the balance faced by Germany, Japan, and Italy. Their attempts to obtain local superiority over Britain would become much harder. The American reaction is framed differently: the Royal Navy's sudden advantage would challenge the prestige of the parity secured through the Washington treaty. A possible funding argument is that naval advocates could cite the imbalance when seeking additional appropriations from Congress.