both of you go to the bank you want to open an account in & fill in the necessary forms. You will need 2 forms of identification i.e. proof of address ( bt bill, electric bill, driving licence etc) and proof of identity ( passport or driving licence if it is one of the new ones with a photo on).. If it is a current account you want to open then you may also need last 3 months wage slips to prove you have a regular income.