Secondly the reverse foot lock has been a bit of a learning curve. I've created a reverse lock joint chain but have since been told that there's a method of using IK's in the foot to do the same thing which gives you more control and the ability to tap the foot rather than just roll over it. Seeing as this isn't a jazz cat I don't think missing out on the toe tap will be too important this time but good to know!
I'll add a video of the rig in action to my vimeo channel when it's finished and after that the animation and final render too. As always any comments, questions or anything feel free to give me a shout.