Parking - SAR 1 legal / query parking signage

Hi, i have a debt collection notice for “debt unpaid” for an outstanding parking charge (parked in a car park for 13mins, was mistakenly directed there whilst visiting on a job site). After losing a POPLA decision, whereby they showed in their documentation that they give 10mins for drivers to park and pay and read terms. I have downloaded the SAR1 legal challenge and my query is

regarding "Parking signage is often not readable at point of entry…” should I delete that as they may point out they already cover that in Premier park contract terms.
The charge is now £155 which seems unreasonable so point B in that doc is definitely my point.
What response should i expect and is there for this scenario a SAR2?
regarding the debt collection notice, one thing they havent stated is when “i need to pay” - their closing sentence is to call to discuss options to avoid progressing the matter. Is that normal?

Thanks very much

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