hi neptun,
I worked in a bank & mistakes like this are quite rare but yeah they can take it back although if its after 24 hrs they have to give you written notification.
in reference to the other answers you've been given, rest assured that the bank has stolen way more from us that you will ever steal from them, not to mention that when they're in financial trouble they seek help from the state ie. our hard earned tax money that was probably intended for health & education!
& what the other person said abut an OAP-the bank will have to respond for them, what they call a 'goodwill gesture'.
You most likely bank with somebody who charges you �35 for an unpaid DD, chq or unauthorised overdraft-which on our end involves sending a letter definitely not worth �35 so my advice to you is ENJOY IT!! & make sure he spends at least half on you!!