Thanks, edited that too. I was making mistakes all the way through that - a combination of doing it between phone calls, etc, and the fact that putting the "before" figures then working out the "before" to "after" change isn't nearly as intuitive as writing down the "after" figures and the relevant changes. I almost didn't post it, pretty sure I'd left one or two errors in but not wanting to spend more time on it, but thought since most of it was probably right, I would, and people could have some fun pointing out the errors.

A tough (if unintentional) 'test' which, as usual, eagle-eyed board members passed with flying colours