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You don't have to undo any of the brake lines at the ends of the axles ... they should all be good.
Only the block which you took a picture of to ask where the spacer went ..... and you only need to undo this, as you have undone the shocks, which are the limiting factor for the suspension travel, and pushing the diff housing down past the normal length of travel may put stress on the flexible brake line from the body to the diff. Undoing the locating bolt just means that it can pop up a little if you stretch it too far.
Remember to bolt it back down when you are done, as you don't want it vibrating unnecessarily, or getting snagged by a stick in the bush
Mic
Mic, cannot thank you enough Mate.
I will give it a crack tomorrow and see how it goes.
My 140k service coming up so thought of doing all this so I can ask the guys to have a quick look too (under extended warranty so need the authorized service).