Prince Harry was greeted with cheers as he started his first official visit to Australia.
The prince is representing the Queen at the International Fleet Review in Sydney, which features around 40 warships from 17 countries.
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It is hoped the 7,400-mile journey will become a cost-efficient and time-saving way of transporting trade between China and the UK.
The Prime Minister said Parliament will be given a binding vote on the final deal, but said the result will not stop Britain leaving the EU.
Officials from the train drivers' union Aslef will meet managers from Southern Railway, whilst the RMT will meet separately with Acas.