Maybe I'm missing it but what happened to the below.
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From my investigation it appears a waiting restriction has been created at this location by means of Traffic Regulation Orders, The Hertfordshire (Fore Street, Hertford) (Prohibition Of Motor Vehicles) Order 2023 and The Hertfordshire (Hertford Town Centre) (Restricted Parking Zone) Order 2023, these orders cannot create a taxi rank as such but rather a waiting restriction with an exemption for taxis. Such a restriction would have to be enforced under code 01 - Parked in a restricted street during prescribed hours.
In order to enforce code 45 - Parked on a taxi rank, there would need to be a taxi rank. A taxi rank is legally created under section 63 of the Local Government (Miscellaneous Provisions) Act 1976, however I do not believe that this has been done. In the absence of a duly appointed hackney carriage stand under the 1976 Act, there is no taxi rank so the contravention alleged on the face of the penalty charge notice cannot have occurred, it follows that the penalty charge must be cancelled.