I got reply this reply from them
"Further to your recent Subject Access Request.
Please find attached all personal data held on Smart Parking’s systems in relation to you and your PCN. The data provided has been re-generated from our system as we hold data in raw form, rather than hard copies of paperwork. For this reason, letters are not reproduced on headed paper and the date displayed is the date of reprinting, rather than the original date. If we are able to provide the original, the same will be attached here for you.
For clarity, Smart Parking process personal data in relation to vehicles which enter the sites we manage, for the purpose of effectively managing car parking sites, including to confirm if a parking contravention has occurred, and for issuing parking charge notices which arise as a result of contravention of our terms.
Our lawful basis for processing this data is our legitimate interests and third-party legitimate interests of our landowner clients. We process your data in the least invasive manner possible and ensure that any data we process is minimised.
We do not retain data beyond the period necessary in order to carry out the purpose referenced above. Only anonymised data is kept thereafter for the purposes of DVLA and trade association auditing.
We trust the above information is of assistance, however if you have any further queries, please do not hesitate to contact us.
We have also provided a copy of our terms and conditions for reference."
And it only shows the PCN number, my details (name, address and car registration number), contravention date, location and contravention P15 number.