Flyinkiwi, they did indeed deliver on their goal. Training for STOVL is much, much more simple in relative terms to the Harrier, hence my point about just needing a STOVL trg package to convert an A pilot to a B. Maintaining currency will be straightforward in the jet and sim.
Lone wolf,
afaik it is A in addition to Typhoon and F-35B. The A can easily replace the Tornado deep strike capability and exceed its payload (with external stores) while maintaining Combat Air mass for the UK.
Evalu8er, there will likely only ever be one training unit and that will be based at Marham. It could deliver B and A trg if given the remit to do so. C is more difficult because there isn't a mock cat and trap deck there. So your question really is about the RN manning 2 combat squadrons and jointly manning the OCU. The answer to that is, "probably, in time" but I don't know for sure. As for the 138 make up, again, no idea.