You are an accountant and financial planner. You owe a duty of care to your client and, in this particular instance, you have breached that duty and your client has suffered financial loss. However, you argue that you were only doing what every other accountant and financial planner does. What protection does the 'peer professional opinion" defence offer you? What do you need to prove in order for the defence to be accepted? What role does the court have in determining whether the defence is valid?