Well thats a surprise......I spoke to Landrover Australia, David? asked him the question and was told they don't offer it on the Defender range. I was at Alto service centre at St Leonards a couple of weeks ago and got the same answer.
Who knows what the bloody hell is going on...
I will say, very expensive though, I had purchased extended warranty for a Navara D40 I had a few years ago it was only $1000 or thereabouts, it was for 2 extra years from memory.
Edit: I'm not trying to be a pain here I find it strange that it is offered on the west coast but not the east coast. I just looked into Land Rover Assured Extended Warranty,
Land Rover Assured Extended Warranty | Land Rover Australia it only mentions 12 or 24 month period, not 36 month. Has your dealer maybe sold you some kind of aftermarket warranty perhaps?
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