Easy Street, agree, I didn't comment earlier as I was not sure of the latest state of play.
The essential difference must be that the RAF can commit 80% of a sqn and even augment a sqn whereas a battalion with a company in training cannot readily absorb a different company from cold.
Interestingly, I believe the Soviets used to have one sqn of a regiment as the training sqn. I guess the RAF does too with training flights or reserve sqns.