Ms Harrison was previously appointed parliamentary under secretary of state in the Department for Environment, Food and Rural Affairs on 7 September 2022, after Liz Truss became Prime Minister. This followed her appointments as parliamentary private secretary at the department for transport, ministry for defence and the department for education. 

Ms Harrison has said of her new role: "Making the most of the UK's resources and reducing the 13 million tonnes of waste that goes into landfill each year is my priority." 

Setting out her intentions for the future of the department, she stated: "We will protect the natural environment and grow what is already a multi-billion pound industry reducing, reusing, and recycling more, and enabling everyone to play their part by making it easier to do so."