Scenario. Friend has a trading account that has some investments in that habenyt been touched for years. linked to an HSBC bank account that no longer exists, because the local branch closed down 2 years ago. Soi we need to establish what HSBC bank accounts he actually has. A quick phone call to HSBS....becomes a 3 hours dance around a dysfunctional [phone banking system ..that... ..reveals that unless you have the details of the bank account they will not talk to you.
Ok, lets try the phone number for 'open a new account' Nope. Same circular track of unless you have a bank account you cant open a bank account.