nuke it from orbit, its the only way to be sure!

You would need to dig around the foundations and pour more concrete to support the existing cocrete foundations. By the looks of it they might have been too shallow to start with so might need to go deeper. 

Mitre 10 has a pretty good guide/video for how to fix a leaning fence.

Just from the photo, that fence looks pretty weathered though. If it's not in good nick, you might be better off knocking it down and starting again.

My opinion; it's ugly and would be more trouble to save than it would cost to build a new fence.

Looks like either the posts are rotten or the foundations are stuffed.. in either case its most likely easiest to rip it down and start again  ( and place the new posts well away from the old holes)

I'd say the whole thing's rotten probably better to rip it out and start again if you can talk your neighbour into it.

And as much as I like the look of cabbage trees, I'd rip them out as well. Never ending job picking up the leaves or unwinding them out of the lawnmower.

That looks beyond repair to me...hopefully the neighbour will be a good bugger and go halves?

Thanks for the advice everyone, its 30 yrs old and tree/vine damaged  so seems like nuking it from orbit is the way to go.  Is a fairly short section about 5 metres so hopefully not too expensive especially if manage to go halves.

Shouldn't be any trouble to go halves. If the neighbour refuses, you can force them to pay half (eventually) via the Disputes Tribunal.

jonb:

 

Thanks for the advice everyone, its 30 yrs old and tree/vine damaged  so seems like nuking it from orbit is the way to go.  Is a fairly short section about 5 metres so hopefully not too expensive especially if manage to go halves.

 

When I last looked it was about $90 per metre for a standard 1.8m paling fence to be built by a tradie. $450 to get it built right or $150 worth of materials and half a day to do it yourself.

kryptonjohn:

And as much as I like the look of cabbage trees, I'd rip them out as well. Never ending job picking up the leaves or unwinding them out of the lawnmower.