Hello, after submitting my appeal and a long wait, I finally received the council’s reply letter of rejection. Exactly as you said, they pointed out that it’s driver’s responsibility to check the signs. I was also observing this sign for a while after that unlucky day, the sign is still turned away from the road, many more drivers get caught into this trap. It must have happened to others as people stopped parking on that road, but the sign still turned away and practically invisible to drivers from the road.
However, the question is whether there is a chance to cancel this ticket? Thank you for your advice.