I've produced a blocking pass for the current animation task.
This is my first real go with proper expressions, and it is, will be, my first real go with lip sync. Thankfully, I've had a bit of training in that department thanks to a book called 'Stop Staring'.
Also I found a blog entry that fixes the issue I've been having with skewed playblasts from Maya.
The trick is to set it to render a size with the correct pixel aspect ratio. 640x480 is a good starting point for playblasts.
http://markj3d.blogspot.co.uk is where I found this helpful tip. He's covered another couple of issues there, in case you've been getting other results.