Ed,

Yes, I'm in England. I'm not sure where all the people posting on Eng-Tips are though, as the that forum doesn't appear to
log locations.

Here's the relevant extract from that second link:
Quote
Navy uses green for motor running, blue and yellow for circuit breaker open or closed.

ASTM F 1166 section 9.19 has color coding for indicator lights.

I'm looking at a picture of a ship's control console and the only red lights are alarm lights and emergency stop buttons. If there is an illuminated "stop" button (for a pump) or "close" button (for a valve) it is white.
Is that incorrect, or do ships use different schemes than subs?

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The UK is, frankly, frighteningly good at their anti-sub warfare. Side effect of being an island nation, maybe?
Well, we're said to be a maritime nation -- Britannia rules the waves etc. We had quite a lot of practice with subs during the 1940s too. [Linked Image]