If the PCN remains unpaid after 28 days of the date of service of Notice to Owner (or Enforcement Notice), a Charge Certificate is sent by post which increases the charge by 50% of the original amount, giving 14 days for payment to be made.
Once a Charge Certificate is issued you can no longer make a Representation. If you were not aware of the contravention prior to receiving the Charge Certificate, or if you have received no reply to a Representation or an Appeal, you will have to wait to make a Statutory Declaration.