Firefly has developed a groundbreaking solution to produce Sustainable Aviation Fuel (SAF) from post-anaerobic digested sewage sludge (biosolids). The first-of-a-kind commercial plant, based in Harwich, is planned to be operational by 2028/2029, and will be realised through a collaborative effort between Firefly Green Fuels, Chevron Lummus Global, several UK utility companies, and Haltermann Carless. Firefly has the potential in the UK to process more than 3 million tonnes of biosolids per annum, helping to address the water industry's land bank issue, whilst contributing to the UK Government's targeted SAF mandate of 10% by 2030 and 22% by 2040. Firefly's core enabling technology is hydrothermal liquefaction (HTL), a wet thermochemical process that eliminates the need for feedstock drying. This presentation will highlight recent advancements in producing biocrude from biosolids, based on the first industrial-scale HTL trial conducted in the UK. Additionally, new findings will be shared on the impact of the HTL aqueous phase on biological treatment processes within wastewater treatment system.