Private parking charge notice

Rembrandtsbrother

I've just received 3 Parking Charge Notices from a local private car park that I regularly use. 
The car park has recently had ANPR cameras installed and new signage stating the terms of use.
I didn't notice these changes and continued to use the car park as usual. 
As soon as I received the first PCN I stopped parking there, but as it took 7 days from the issue of the notice to me receiving it I'd park there another 2 times.
I had paid the first one promptly for a quiet life and then received a further 2 PCNs.
Is there an argument to have at least one of these further charges cancelled as I didn't realise I'd be charged until I received the first PCN? I realise that I should have read the notices, but I didn't even notice them as the car park was free for years prior to now and I'd got into a habit of just parking there.
Any advice would be gratefully received! 
Thanks 

Gr1pr

None of them should have been paid 

Extra notices should have been provided from the get go, so study the joint Code of Practice 2025 to see what the requirements are, as seen in various threads on here 

https://forums.moneysavingexpert.com/discussion/6642734/claim-form-for-pcn-received#latest

https://forums.moneysavingexpert.com/discussion/comment/81679094#Comment_81679094?utm_source=community-search&utm_medium=organic-search&utm_term=code+of+practice+signage+changed

Name the private parking company