Free Traffic Legal Advice

I am the registered owner of a car that overstayed in a Waitrose car park (England) by roughly half an hour, ie nearly 2 hours rather than 1.5. Assume pls for this post that all signage etc is correct and that the Charge Notice was issued correctly, as that isn't what I'm asking.

The contravention occurred on 12/12/2023. I have only today found both Notice and Reminder, for various reasons a small pile of post had sat unnoticed in a corner until today.

AFAIK I have had no contact from Britannia since. It is now over 6 months since the parking contravention, my question is - what now? On their website my Charge Notice can still be accessed by putting in the number and car reg. The outstanding amount is the full amount without anything extra added (£95).

Is there a time limit for them to instruct debt collectors/initiate legal action? What do they tend to do or how long does it take? I would have paid the lesser amount immediately if I had seen it in time, and I will pay the larger amount now if that is necessary to prevent further action or financial charges, but obv would rather pay nothing. Grateful for any insight, thank you.