The Aussie author is Tom Roberts, he is brilliant.
I haven't seen the video will have to go have a look at it.

I have been having an issue with Tally invading my personal space of late, and have had to be really firm with him; but I have found that there is a thin line and if I push him to much he goes up to rear.

It's always fine tuning and finding the best parts of any training method and putting them together to get what works for you and your horse.

Love the picture by the way!