Well, I have to say, based on your photo and GSV view that you look bang-to-rights on the contravention itself, but this may not mean it's game-over as many appeals are won on what the council have failed to do correctly. They must obey the law same as you when they throw PCNs around like confetti. So there may be a 'technical' appeal argument, but as these are invariably dealt with at London Tribunals you must be prepared to forego the discount option.
