Just to add a comment about this RAFVR call up bit, I came out of the Cambridge UAS in 1979, kept my flying going, and was still in the Reserve when the Falklands started in 1982.
I never heard a dicky bird.
By the time of the first Gulf War in 1991 I was an ATPL, having been out of the UAS 11 years, still nothing.
Thankfully I am now too old to fight.
So I wouldn't give that thought the time of day.
W