It should cost £5/month or free if you debit over £1500 a month.
When I took the account out it was hit or miss whether or not I would actually hit the £1500/month so I set up two direct debits of £500/month to go back and fore my savings account on the same day to ensure I clear the £1500/month.
These days I clear the £1500/month with ease but never got rid of the DD.
I moved some money about, bought some shares, acquired an Astra and bought a load of Christmas prezzies meaning there wasn't £500 in my savings account.
Now the bank wants to fine me £10 for each of the failed direct debits. The direct debits where I was paying myself. £20 for f*ck all.

Without a doubt my fault for not keeping an eye on it but absolutely scandalous. I didn't even know they could do it!

I can see a few angry phone calls and some threats to leave when they open in the morning unless they waive the fines.