The Great Idea Robbery

Catriona writes: I am on a fortnight's holiday  (US = two weeks' vacation) but with fortunate timing, my friend, writer and Bloody Scotland organiser Gordon Brown, is here in my place, talking about a sequel I'm delighted to be hearing about, an idea decades in the making, and  - you don't see these every day - an actual honest-to-goodness McGuffin.
Take it away, Gordon.

On the 8th of August 1963, the most famous robbery in UK history occurred when a Royal Mail train, running from Gla...