2017 HMS QE presumably in service but only with helicopters. 2025 first F-35s on board. There are still Harriers operating in some countries - why isn't the gap filled by buying some. It would get the ship up to speed on fixed wing operations surely. One would imagine at least some Harriers might be acquired quite fast.
USMC F35B deployment on QE before 2020 inc exchange air/ground crew.