Possible Clues:

• Mutual influence
• Mutual action in Pinter play at Lyric
• Penalty I converted, securing Reading's first, demonstrates teamwork
• Reciprocal relationship
• Mutual actions modified party line
• Mutual action in The Caretaker, for instance? Not initially
• Reciprocal action and reaction
• Party line developed into mutual exchange
• Drama about caretaker, for example, initially powerless in mutual action
• Mutual actions revised party line