The UK is implementing an Electronic Travel Authorization (ETA) for foreign visitors, effective January 8, 2025, for many countries, including the US, and April 2, 2025, for the EU. Travelers must apply and pay a £10 fee, valid for two years. Initially, transit passengers needed an ETA, but following industry feedback, the UK exempted airside transit passengers, affecting mainly Heathrow and Manchester airports. This exemption may become permanent. To offset revenue loss, the UK plans to increase the ETA fee by 60% to £16, pending approval.