Admiral Lee could join a combined fast-battleship force

Could Admiral Willis Lee command fast battleships alongside Renown and Prince of Wales?

Yes; this theater strongly favors a combined fast-battleship group, potentially with additional Royal Navy ships.

If Willis Lee receives the American fast battleships as he did historically, the alternate theater offers a strong reason to combine them with Renown and Prince of Wales. Britain might send still more fast capital ships east while older, slower battleships return to Atlantic convoy and bombardment duties. A common operational speed would let the coalition keep its carriers and modern battleships in one maneuver force. Speed and mission compatibility provide the basis for this fleet organization.