To open a UK bank account, the levels of ID you need may vary per bank. But you will always need a valid form of photo identification (ie Passport). 

You will also need to provide: 

• Personal details (full name, date of birth etc) 
• Address details &
• Contact details 

One of the most popular banks for Australians resettling in the UK tends to be HSBCUK, though many report Monzo a more straightforward process.