coney - It's another typical example of a excessive unfair charge they are simply profiteering from this action, if you consider how many customers will have received the same basic but cheap letter and resultant charge this morning, that's one hell of a lot of profit. !
You should ring and speak to a supervisor / manager and tell them this charge is grossly disproportianate and excessive to what it has actually cost them to produce, when all their admin charges have been combined into the equation plus postage charges.
Demand in a polite but assertive manner that they credit your account immediately with at least £20 if not the full £25 for the inconvenience; because there is no way you, anyone or indeed the Financial ombudsman would in fairness believe it has cost them more than £5 to produce and post this basic generic letter...and that £5 is being over generous IMO.
If they won't play fair then put your complaint in writing telling them that after eight weeks if the complaint is still unresolved, you then intend to complain to the FOS about the unfair excessive charges they have levied against you for this simple basic letter, the FOS complaint costs the bank.
This is the only way the greedy big institutions will learn, when they realise that fleecing customers is actually counter-productive and actually starts to cost them money.... when enough people do complain until that day arrives, they're very much on the "Gravy Train" just like the M.P.'s. ...thank you very nicely. !
http://www.financial-ombudsman.org.uk/consumer/complaints.htm