The NtK fails the requirements of PoFA in that there is no "invitation" for the keeper to pay the charge. PoFA 9(2)(e)(i) is missing from that NtK.
https://www.legislation.gov.uk/ukpga/2012/9/schedule/4/enactedHowever, both UKCPM and their incestuous IAS will ignore this fact. By all means try an appeal with UKCPM but only appeal as the keeper. Point out that you are appealing as the keeper and include the point about "double dip" and "orphan images" and the spiel in my earlier post.
There are 4 plans you need to follow:
Plan A which is a complaint to the College and ask them to get their agent, UKCPM, to cancel the PCN due to the "double dip" which you are able to evidence.
Plan B is the initial appeal to UKCPM as explained above.
Plan C is an appeal to the IAS if Plan B is rejected. An exercise in futility.
Between Plans C and D, you have to weather a storm of debt collector letters which can all be ignored as they are just trying to scare you into paying up. They have no skin in the game as they are a third part to the contract you have allegedly breached with UKCPM.
Plan D is a claim hearing where a truly independent arbiter, a judge, will decide whether you owe a debt to UKCPM. They usually don't want to go that far but they will if they think you are low-hanging fruit on the gullible tree and are likely to capitulate and pay up when you receive a claim form from the CNBC.
For now, try Plan A and then Plan B (but don't miss the deadline for the Plan B appeal). Show us what you intend to send before you send it.