There are several areas where you may park when attending performances at the theatre. There is on street parking in Hanover Street/Gas Street on single yellow lines after 6pm. Those with blue badges will know they are also able to park on double yellow lines.
Slightly further from the theatre there is the Ashburner Street Market car park, which is just the other side of Moor Lane, and is free after 6pm. You may also park for free in the car park behind the fire station. This is only a very short walk away from the theatre.