This was the wording of the challenge, submitted 22nd March, based on Incandescent's advice to at the very least go for the reduced rate:
To whomever it may concern.
I am not appealing to have this PCN cancelled, rather I am asking for the discount rate to be reinstated due to the
unfortunate circumstances that have prevented it from being dealt with promptly, as the details below explain.
Unfortunately the registered keeper was out of the country during the time when the PCN would have been
received at the vehicle's registered address. They didn't return to the UK until the 14th March which is out of the
14 day discounted rate window.
Had the registered keeper been present at their home address, and in the UK, when the PCN was first received
then it would have been dealt with promptly and payment would have been made right away.
Please may you reinstate the discounted rate, and then it will be dealt with right away.
Regards