You will need this licence to drive a multipurpose substitute taxi for hire or reward. A multipurpose substitute (MPS) taxi is a wheelchair accessible taxi the meets the identical requirements of the primary Multiple Purpose Taxi (MPT).
An MPS taxi licence is available to accredited operators who require a vehicle to be on stand-by to substitute for an existing standard or MPT at times when that vehicle (the primary taxi) is being serviced, maintained, repaired, or is otherwise unavailable for use as a taxi.
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.