The current account switch guarantee means your bank account will be changed within 7 working days.
You can choose and agree the switch date with your new current account provider. Between them, the two banks will make sure that all payments going out such as direct debits and all payments coming in like your salary will all be moved from the old account to the new one.
And for even greater peace of mind if anything goes wrong with the switch, the current account switch guarantee means that you will get a refund on any interest and charges on both the old and new account.
So if you are not happy with your current bank it might be worth comparing and switch to another one.