Just This Once, 809's reformation has been 2023 for some time - perhaps this changed from a prior declaration but I can't recall such; the SDSR assumption is for 2 front-line UK F-35B squadrons in 2023. Realistically, the training for those destined for the 'Immortals' will have to begin prior, but this will be in the UK, at Marham. Most/all of the current USA cadre are destined for 617 Sqn or the (as yet to be named) Lightning OCU, as both squadrons will be jointly manned through-life (as will 809).