PERSONAL PROPERTY - assignment of bare right to damages constituted by rights arising under or out of a lease - assignee a beneficiary under a discretionary trust which indirectly owned shares in assignor company - whether assignee had a "genuine commercial interest" in the rights - Trendex Trading Corporation v Credit Suisse [1982] AC 679 - whether necessary for the existence of a relevant genuine commercial interest that the assignee has a pre-existing legal right against the assignor.