THE Hongkong Bank of Australia (HKBA) has announced a shake-up in its Australian arm after the retirement of chief executive John Dickinson. Mr Dickinson would retire in February, to be replaced by Chris Crook, the bank's chief operating officer, the bank said yesterday. It also announced a new head for the Australian operations of Midland Bank. HKBA said Mr Crook, who would take over on February 22, had been with the HSBC Group for 34 years. Mr Crook had worked for the group in Japan, Bahrain, Hong Kong, India, New York, the Philippines and Singapore, it said. HKBA managing director Marea Laszok had been appointed chief executive of Midland Bank's Australian arm. She would be replaced as managing director of HKBA by Stuart Davis, now head of commercial banking. HKBA has 11 branches, and assets of A$3.6 billion (about HK$20.47 billion).