Got your PM - will reply here.
The OFT "ruling" had nothing to do with businesses at all. The reason is because they used the Unfair Terms in CONSUMER Contracts regulations.
You cannot use the OFT at all.
You must rely on the 1915 Lord Dunedin ruling regarding penalties in contracts.
Nearly all of the case law supporting this is between two businesses.
Have a read of the FAQs - the answers are all in there
As per the Transmission Charges, I would need to know more about these.
Is that charge a fee for providing the account? You can only use the Penalties v Liquidated damages argument for penalties - not for the cost of a service provided.
There are also standard letter templates specifically for businesses in the library section.