To help you to understand the POPLA code, although there are online "checkers" for these provided by a few, Parking Prankster for one. It breaks down as follows.
The first 3 digits, in ANPR's case, 041. Are the operator code that POPLA use to identify the operator of the car park, and the charge issuer.
The next 3 digits is the day of the year that it was issued. For instance, if the code was generated on 2nd January, that would be 002. If if was generated on 1st Feb it would be 032 and so on.
The 7th digit refers to the year it was issued. For last year, that would be a 3. For this y