I didn't read everything properly and am a bit concerned that I have given LTSB a way out.
I sent the first letter to LTSB and received a response along the lines of, "our charges are fair, our charges are fair, we're sorry if you don't like it.. take it up with the banking ombudsman".
Immediately after receiving this I started a small claims through MCOL and followed it up with a schedule of charges to Northampton County Court.
I've since read in the FAQ that a) I should have warned LTSB that I intended to sue and b) that in order to use MCOL, LTSB must have received two schedules of the charges.
I realise I should have read up on this properly in the first place but would someone be able to tell me whether what I have done is going to present a problem and, if so, what I can do about it at this stage.