Yes, the United Kingdom (Great Britain) is fully included in the Interrail and Eurail programs in 2026. Despite Brexit, the UK's participation in the Interrail scheme remains unchanged because Interrail is an agreement between national railway operators (like National Rail and Avanti West Coast) rather than a European Union program. The Interrail Global Pass is valid for travel across England, Scotland, and Wales. For UK residents, the pass also includes one "outbound" and one "inbound" journey to help you leave and return to the country via the Eurostar or a ferry. However, it is important to note that while the pass covers the "fare," high-speed services like the Eurostar require a separate, mandatory seat reservation fee (typically around £30). All major UK train companies, including LNER, GWR, and ScotRail, recognize the pass, making it a highly effective way for international tourists to explore the British Isles.