If you are moving to visa on a working holiday visa or a work visa, you must first apply for your biometric residence permit.
You will need your UK phone number for your CV when applying for jobs, open up a bank account, and easily reach out to landlords when looking for a place to live.
All branches are different, even if they belong to the same bank, so if you fail to get a bank account at one location, you can still apply at the same bank down the road.
All you need to set up an account is a UK mobile phone number and a UK address for your bank card to be delivered to.