So, the speed painting turned out reasonably well. Using the strong tone wash didn't significantly reduce the painting time, but certainly helped. I still had to build the colours back up from the shading effect it created, but they look ok from relatively nearby so should be fine on the tabletop once based.
I also spotted the imminent release of the new Perry Foot Knights as advertised on their website:
Now how on earth am I going to resist buying those?!