John takes his car for repairs at Abiros garage. John is asked to sign a contract which states that Abiro accepts no liability for minor damage to the bodywork of vehicles left for repairs, however caused. When John queries this he is told incorrectly by Mark an employee of Abiro that it only applies to damage by third parties whilst the car is parked in Abiros car park. John signs the contract. What options has John if his car is

a. Destroyed by an employee of Abiro

b. Destroyed by a third party