The parking ticket is pink. 2 - 3 weeks after the shock of finding the ticket on your car you will receive notification through the post. If you pay the fine within 30 days you get 30% discount, or you can try arguing the point at the Police Station if you think you have been unfairly fined. (DaRKeTaMiN is very good at this!). If you do not pay the fine the authorities will eventually track you down. You may find your bank account embargoed and you won't be able to sell your car until the debt has been cleared.
Don't know what the blue copy is. Can anyone else answer this?