Yes. Even if you no longer have the account, if you think you were mis-sold and you can get your hands on the paperwork then you can complain to your bank going as far back as when you had the account.
However, it gets harder to complain about a packaged bank account that is over six years old.
That's because banks have been known to use 'time limits' as a reason for rejection, and in the event you need to escalate your case to the free Financial Ombudsman then this must be done within six years of the package bank account being sold or within three years of knowing you could make a complaint about it.