OK, you're cross, but if you are to appeal this PCN, you need much more than this. What can win an appeal is the signage. The Flying Motorbike signs are essentially the same as a No Entry sign for a motorist; did you understand what the signs meant ?
We need to know the state and positioning of the signs and also if there are any advance warning signs. So please post a GSV link if the last view is reasonably up=to-date. Also please post up all of the PCN, only redacting your name and address.
Sometimes the TRO establishing the restriction is flawed or out-of-date, so somebody on here will probably investigate this aspect, but it would be a long shot.