OK, I've looked up all six PCN numbers you provided - two of these (JK17555685 and JK18627114 issued on 29 October 2025 and 25 November 2025 respectively) are beyond the point when you can appeal them further as you have run out of time. This assumes you received the Notice to Owner in the post and either didn't submit formal representations, or did and received the Notice of Rejection. If that isn't the case please make it clear to us.
JK18627114 has already reached the £250 stage which means Southwark have applied to register the debt and you could be looking at Bailffs in the near future.
In respect of JK17555685, which is the oldest of the PCN numbers you provided here, the council photos show there was already another PCN affixed to the vehicle when this was issued, which suggests there's another PCN not in your list (unless the council already cancelled this one)?
For three of the other four PCNs (JK18987437, JK19029399, JK19061416 issued on 16 January 2026, 26 January 2026 and 28 January 2026 respectively), they are still at the £80 discount stage with the council portal suggesting you've submitted an informal challenge which has been rejected. These are still in play and should be beatable based on the lack of signage (but you need to stick to the formal process and deadlines).
The final PCN is JK19743857 which was issued on 26 May 2026 and has been paid. That suggests this is the PCN in respect of which your vehicle was towed and which you paid to release. I guess they towed you due to the vehicle having so many outstanding PCNs which marked you as a serial offender in Southwark's eyes.
Others will be better placed to advise you on the two oldest PCNs and whether there's anything that can be done on these.
For the other four, these should be beatable. Out of interest, when you picked up your PCN at the car pound for JK19743857, did it show signs of being folded? They are obliged to serve it on the vehicle before it gets towed but they sometimes don't bother and just take a photo of an empty PCN envelope on the windscreen which would invalidate this PCN if so.
Can you also clarify the status of the extra PCN which was served before 29 October 2025 (i.e. the additional PCN on the car in the council photos).
EDIT - I guess the "additional PCN" is the warning notice you referred to in your original post?