Chinese tourist visa by UK citizen currently in Australia

I am living in WA, on a working holiday entry permit. I'm looking at going to China for a week, few days in Beijing then a few in Xian before heading to Thailand. However I hold a UK passport. I was wondering what options I have to apply. If I have to visit an embassy how long will the procedure take before being able to reclaim? Or can I apply in Hong Kong. Many thanks.