Hinduja flagship company Ashok Leyland has acquired an additional 49.1 per cent stake in British bus maker Optare Plc for over Rs 30 crore, taking its total holding to 75.1 per cent. The company had initially acquired 26 per cent stake in Optare in July 2010 as a long-term strategic partnership. The move integrates Optare into Ashok Leyland's global strategy for buses.