If you follow the process outlined by HCA and others here, you will get the CHarge Certificate cancelled, and a new PCN sent to you that you can pay at the discounted rate, or submit representations.
BTW,don't let you or your wife be intimidated by the Charge Certificate, which is seriously mendacious. In traffic and parking contraventions where PCNs are served to car or by post, county courts are NOT involved. In order to enforce PCN debts, councils throughout the UK are obliged to register the PCN debt at the Traffic Enforcement Centre based at Northampton. This is a form of county court, but has no judges and no courtrooms. ALl TEC do is register the debt (for £10 - added to your debt), which then allows the council to send you an Order for Recovery, which you can, of course, pay, but most people just submit a WItness Statement (for PCNs under the TMA 2004), or a Statutory Declaration, (for London-specific Acts like the LLA & TfL Act 2002).
There is no possibility whatever of a CCJ in any circumstances. The legal process was carefully written way back in 1990 to make sure CCJs could never be granted.