Continuing the theme that I began over five years ago which is that the title is a phrase spoken by one of the characters, I've finally got it.
Curiously apposite at the moment, and I can't help but feel that might have helped me reach a decision.
So here we go:
Truth to Power.
Watch for more updates as I put the 'finishing' 'touches' (that is, write the fifteen or twenty thousand words it still needs) to book IV of These Matters, Truth to Power.
When to the sessions of sweet silent thought