It was, and presumably is, quite big in the british wargaming community. The civil war starts with Edward not stepping down as you said, allowing for a rehash of the English Civil War with lots of different groups and alliances like communists, Scottish seperatists, Scottish unionists, socialists not alligned with the other socialists, an Anglican league, British Union of Fascists and all sorts joining in the fun.
An official forum
can be found here