A three year probation period sounds a bit long to me, Bill.
I rather suspect it would have been something to do with Pension Rights, or some such thing.
But I expect we shall be seeing this as an emerging trend. That is, techs on "short service commissions", and far more moving around (moving on) after every few years or so. In a way that could be a good thing. A broader experience for the techs, and a wider dispersal of ideas.
Meanwhile, in the Real World job security (security of tenure that is) went out the window long ago. And so, therefore, has loyalty (and, indeed, continuity).
Everyone's a freelance now, Bill (or in the near future, anyway). Especially as forces from the
Dark Side continue their onward march* throughout the realms of NHS biomed shops.
Forget the VRCT (it's so
yesterday, anyway). It's not proactive. The world moves on too fast for that sort of thing to be much use. Let's start our
own gang!
Oh, the Power of Positive Thought!

*
Have you heard of any reverting back to in-house? No, neither have I.