I am already at work on the TV script.
My Dad had a Rolls Razor (we were never going to have the other kind of Rolls) and I was fascinated by its solid construction and mysterious operation, but it never occurred to me what its practical advantages might be.
And all the Kipling - Dad was a fan, as am I - and Danny's reference to Gentlemen-Rankers... That is one of Kipling's most powerful verses, although American readers will recognize it from the Whiffenpoof Song, which was adapted from K's original.
Left unsaid is what the G-R's had done to earn their exile and why it could not be hinted at. But not too hard to guess.
Poems - Gentlemen-rankers