The Taxpayers' Union says MBIE failed to be on top of the scandal. (Image: Getty)The Taxpayers' Union said the Ministry of Business, Innovation and Employment took too long to suspend Australian-listed company Corporate Travel Management from its all-of-Government travel panel following growing revelations of overcharging in Britain, Australia and NZ that started a year ago.But a public procurement academic says it was likely investigations had been going on internally while ensuring the business of travel continued.BusinessDesk revealed last week that the Ministry of Business, Innovation and Employment (MBIE) froze Cor...