A substitute taxi licence is available to accredited operators who require a vehicle to be on stand-by to substitute for an existing standard taxi at times when that vehicle (the primary taxi) is being serviced, maintained, repaired, or is otherwise unavailable for use as a taxi. An operator must be accredited and must hold a current standard taxi or MPT licence.
The primary taxi must not be operated while being substituted. The primary taxi must only have one substitute taxi operating under the primary taxi licence at any one time.
In-service substitute taxis must not be older than nine years of age.