Will do.
Yes, I am the registered keeper and my name and address on V5C are correct and have been since long before this.
For the benefit of anyone who might read this in the future, the URL given in the How to make representations against the Penalty Charge section leads to the parking fine page of the council website, which only refers to parking. Clicking through from there as if challenging a parking fine seems to work, as it finds the PCN and shows the photos and videos. There is a separate bus lane penalty charge page, not referenced in the PCN, that ultimately links through to the same form to challenge a PCN.
Actual representation submitted:
I challenge this PCN on the grounds that the PCN was given outside the 28 day period allowed in law.
Please cancel the PCN.
Thank you for your help! I'll post an update when I get a response.