It's not unusual

Companies with unusual listing structures pose particular problems for investor relations officers. True dual, or even multiple, full listings are relatively rare, with Anglo-Dutch companies such as Shell, Unilever and Reed Elsevier the most notable European examples. But how do you cope if your stock market quotation is in both London and Melbourne, or London and Johannesburg? Or if your operations are based in Hong Kong, and you are listed in London? As mergers, takeovers and acquisitions