To ask the Secretary of State for Environment, Food and Rural Affairs, with reference to the Answer of 20 September 2023 to Question 198801 on Exhaust Emissions: Environment Protection, how much funding has been provided for Selective Catalytic Reduction bus retrofit technology (a) since 2013, (b) in total and (c) per scheme.

Government provided £19 million for trials of retrofit technology including Selective Catalytic Reduction through the 2013 and 2015 Clean Bus Technology Funds and the 2014 Clean Vehicle Technology Fund. £64 million was provided for Selective Catalytic Reduction bus retrofit by the 2017-2019 Clean Bus Technology Fund. Between 2017 and 2023 the NO₂ programme provided £31 million for bus upgrade and retrofit schemes to local authorities, with some local discretion about how this funding is allocated.