British Pacific Fleet attacks Yamato

Could the British Pacific Fleet have sunk Yamato's force if it conducted the Okinawa strike?

Yes. The British Pacific Fleet is judged to have sufficient carrier striking power to destroy the force.

The British Pacific Fleet had sufficient carrier striking power to destroy Yamato's force in this scenario. The comparison turns on the strength available to both Allied carrier forces. Admiral Fraser might try to bring his flagship north to participate, having already been involved in sinking the last German battleship to go to sea, although he is considered unlikely to arrive in time. The exchange then turns into a joking extension in which British naval leaders reach Japan before MacArthur and arrange the surrender ceremony. That imagined race is separate from the assessment of the carriers' ability to attack Yamato.