Catch Up The process where test data recorded while testing under Contingency Testing is subsequently entered. Cessation The process by which an authorisation, approval or designation is brought to an end. Cessation is used in place of the previous terms for termination/surrender or withdrawal of an Authorisation/Designation or disqualification of a Tester/Inspector. CT Contingency Testing, the process by which testing may continue when the computerised system is not available due to a wide scale failure affecting a significant number of VTSs. CT20 An MOT Test Certificate for issue during a period of Contingency Testing. CT30 A notice of refusal of a MOT Test Certificate for issue during a period of Contingency Testing. DC Designated Council. Local Authorities authorised to carryout MOT tests.