Thanks for the info, Dennis. Greatly appreciate you relaying your experience with this.
Yep, it seems the British paint codes don't directly cross-reference with any DuPont or other American equivalent.
I've just now returned from the auto body/paint shop after taking my headlight bucket and Cardinal Red front fender to them to match. They seemed to know that this particular candy color is a two step process(three including the final clear coat) and said they're confident they could to do a good job of matching it.
They said it would be done by the end of the week, and so I suppose I'll see then if their confidence is justified.
(...thanks again!)
