Got an email back from Shane at Whyatt's Land Rover in Geraldton WA, (who did a mountain of work on my County and I would highly recommend him!). He thinks cross pin n the front diff.
I dont really have the time to play with it, so will get it to a mechanic to have a look :)
Funny how its not making any grinding or crunching noises when I do get it driving though (??).....

