Posted: 17/04/2012 at 21:48
I have had success with docks using a spray called SBK with is fairly cheap and easy to get hold of and less toxic than Grazon (they'll laugh at you if you try Glyphos, it is not strong enough in the normal dose). Try to leave the spray for as long as you can bear the long grass as the more leaf area there is then the more of the chemical will get into the root, just before flowering is best.
To recover the lawn/paddock hire a brush mower or if you are feeling macho google Wolseley Clearway, they come up on ebay every now and again and I will vouch for them though you may also need a pipe and flat cap to go with it. After that go back to the mower and a repeated close cut will prevent any course weeds like dock coming back.