The UK is making significant strides in transitioning to zero-emission bus fleets to combat the transport sector's high emissions. London, with the largest ZEB fleet in Western Europe, leads the way with 1,700 ZEBs, including a small number powered by hydrogen. While diesel buses still dominate, bus operators are setting ambitious net zero goals. The adoption of ZEBs not only aids in emission reduction but also aligns with ESG objectives, crucial for attracting investors. Challenges like charging infrastructure, renewable power sourcing, hydrogen production, and cost considerations must be overcome for a successful transition. Initiatives such as green hydrogen trials and innovative charging solutions are paving the way towards a greener future in the UK's transport sector.