been hmm, you do seem to want help the residents of the Close from being exploited by CPS when it appears that they don't want your help, they just want you to park somewhere else!
I don't think it has established CPS's parking controls would be illegal or ineffective, but I'm not an expert. Even if they are ineffective is it part of a Parish Councillor's role to save people from themselves if they don't want to be saved ?🙂
A few options
1. Ignore and see how they respond
2. Contact the bank and negotiate direct a repayment plan
Also the people you got the letter from monitor this site so please be mindful when posting personal details is my advice
Don't touch them owe me £500 since January 2019 make excuse after excuse. Seem they always have software problems sending money out. Keep saying they will call back or email nothing been chasing it now for 6 mths the phone staff always have the same banter we will chase it up and get back to you then nothing!