Nine member companies of the Natural Gas Vehicle Network (NGV Network) have written an open letter to Chris Grayling, Secretary of State for Transport, to ask for clarity on the Government’s developing Road to Zero strategy which could have wide-ranging implications for key transport policies in the coming years. The letter highlights members’ concerns that the strategy is being developed using old data and flawed models which are used to compare conventional petrol and diesel vehicles with cleaner alternatives, such as natural gas.