Thanks Guys, most appreciated.
I took Ponz's advice and knocked it back with some 0000 steel wool, and applied another coat of stain. I'm not sure if coat #5 was the turning point, but it's looking much darker this morning. Admittedly, that is looking at it in the poor light of my guitar room! I'll have a better look at it over the weekend in natural light and try and get better photos for everyone!