2 It is convenient to deal first with the application to amend. That, in turn, requires some, albeit brief, consideration of the facts. The plaintiff was, at all material times, an investor in a business run by Whittakers Ltd ("Whittakers"). The defendant is a major banking institution. In or about September of 1997, discussions took place between representatives of the plaintiff, Whittakers and the defendant with a view to the defendant taking over as Whittakers' banker. As part of this transaction, a credit facility was to be provided by the defendant to Whittakers. This credit facility was to be secured by an irrevocable letter of credit to a limit of $5,000,000, procured by the plaintiff from its banker and a charge over the assets of Whittakers. Pursuant to this agreement, the letter of credit was issued. Whittakers' business failed to prosper and on 11 May 1999 the defendant appointed receivers and managers to the company. On 28 May 1999, the defendant claimed under the letter of credit. The plaintiff says that the defendant was not entitled to enforce the letter of credit and it bases that claim on a number of different grounds. First, it says that, in calling upon the letter of credit as it did, the defendant was in breach of its contract with the plaintiff. Second, the plaintiff raises claims under s 52 and s 51AA of the Trade Practices Act 1974.