To be frank, you have virtually nothing that would form a robust appeal at London Tribunals, and any reps you submit to Westminster will be rejected.
You parked in a well-marked out parking bay. There is a sign for it located at the end. Whilst it would have been better practice if the council had placed a sign at each end, they are not obliged to. The bay is not hugely long, being 25.2 metres in length. When parking in a marked bay the onus is on the motorist to find out if there are any restrictions on the use of the bay by looking for the controlling sign.
The sign has no days or hours for the restriction which means it applies 24x7
The payment advice slip is not printed very well, but is not part of the PCN, it's an 'add-on' for convenience.
Sorry if this is not what you wanted to hear, but it is reality. However don't rush to pay the discount, as you have 14 days from the 1st January. There could be a 'technical' appeal based on Westminster mismananagment of the enforcement process. Such appeals have nothing to do with the actual contravention, but by their nature, are usually dealt with at London Tribunals, so the full PCN penalty of £160 would be in play. However, our Mr Hippocrates has been very successful with such appeals so wait a bit, but don't miss the deadline for the discount if you are minded to pay it.
Final thing - is the car yours and are you the holder of the VC Registration Certificate ?