London to Sydney, by bus

When I first heard about a bus service between two islands (England and Australia), I thought it was an obvious way to reel the suckers in.  But, no, a mostly overland bus route exists and takes 12 weeks to make the entire journey.  I've been to several places on that journey -- London, Vienna, Delhi, Kuala Lumpur and Sydney, but oh the places in between: Prague, Gallipolli,  Corbett, Kathmandu, Bali, Ayers Rock.  That, I think, would be an awesome way to spend 3 months.