Thank you everyone for the replies.

I'll stay out of the politics, I'm pretty sure my leanings would ruffle a few feathers in here.

As for the weed, given how much of it I see around Geelong I'm really suprised it can't definitively identify it. I found a Vic government website, probably department of agriculture or whatever they call themselves these days, and using their identification tool I still wasn't able to find anything close.

I'll continue on with my spot spraying and hand weeding strategy, luckily as I mentioned above I've managed to reduce it down to about 1/8 of my acre block and I'm slowly winning the battle.

As for the Lawn Perfect herbicide that was recommended to me, it hasn't really impressed me. I've been using it on my property in Geelong and another block I've got down the highways in the Otways and it hasn't really been effective on the weeds on either property. I'm being quite careful to mix it at the recommended ratio and apply it over the correct area.

Can anyone recommend a general broadleaf herbicide that would work well regardless of which area I would be using it in?