Post a draft here first and I'll tweak it.
Islington should be on a loser here. They need to change the signs from match to event but that will cost a fair bit.
Ah yes I didnt see that controlled sign. I only applied/saw what was near the vehicle. I just did a Google Street View and saw that zigzag sign too. I am new to vehicle ownership in the UK, in Australia we just rely on what signs are near the vehicle, hence my confusion. But I see now that it has that extra information which would have been useful.
I am posting my challenge below, taking into account your info, being:
I had parked the vehicle and noted the attached sign near my vehicle.
The signage stated parking was allowed after 1:30pm provided it was not a match day.
I Googled Emirates Stadium matches and saw there were no matches on that day.
I received a fine and was confused until I realised that council may refer to other events such as concerts.
The CPZ signage was also in a zigzag shape and not clearly visible.
Similar cases to mine have been reviewed by an adjudicator and dismissed, the most recent being case 2250584855 seen by adjudicator Carl Teper, who allowed the appeal on the basis that there was no football match but rather a concert.
Similar cases noted by the adjudicator are 2250451308, the second case 2250480306, the third 2250482414, then 2250512537 and finally 2250234820.
I believe that by the council pursuing this case, they will only serve to waste the resources of the system, especially as the appeal is likely to be successful based on precedent.