Please see the guidance here on posting images: https://www.ftla.uk/civil-penalty-charge-notices-(councils-tfl-and-so-on)/read-this-first-before-posting-your-case!-this-section-is-for-council-tfl-dartme/
But here's a basic draft you can use:
Dear Bristol City Council,
I challenge liability for PCN BS00000000 on the basis that the penalty demanded exceeds the amount due in the circumstances of the case.
The PCN carries an 0870 premium rate telephone number, and I contend that as in Paul Bateman v Derbyshire County Council (DJ00037-2209, 10 November 2022) this amounts to an excessive demand. While I appreciate other payment methods are available, binding authority from the High Court in the case of London Borough of Camden v The Parking Adjudicator & Ors [2011] EWHC 295 (Admin) determined that where one payment method carries a surcharge, the availability of other payment methods is irrelevant and the penalty demanded is excessive.
It follows that the penalty charge must be cancelled.
Yours faithfully,
It's usually best to put this in a PDF and upload it to the council as an attachment, in order to preserve formatting. Also upload a copy of Paul Bateman v Derbyshire County Council (DJ00037-2209, 10 November 2022) (https://drive.google.com/uc?id=11TEzgfHFInCTo-JTFFtWJ8pbIXnMvJCd).