I just looked at my account and realised I was overdrawn because my bank charged me £25.
When I phoned them up to ask why I was charged this money, they advised me I'd been overdrawn the month previous for £6 for about 4 hours (!)
When I asked for the charge to be refunded, as it classifies as unfair treatment under the banking code, I was told only my branch can do this.
My branch is open from 9.15 to 4.45. I work from 8.45 to 5.00
So now, because I'm overdrawn by £3 because of this charge, I'm looking at a £50 charge for being £6 overdrawn for 4 hours
Eventually I got them to agree to call me on Monday to discuss this.