You also have rights under the Rail Passengers’ Rights and Obligations Regulation (EC No 1371/2007) (PRO), as it applies in UK law. The PRO incorporates the ‘Uniform Rules concerning the Contract for International Carriage of Passengers and Luggage by Rail’ (commonly known as “CIV”). For an overview of these rights please visit the European Commission's information website about passenger rights:
https://ec.europa.eu/transport/sites/transport/files/themes/passengers/rail/doc/summary-of-rail-passenger-rights_en.pdf
The Office of Rail and Road (www.orr.gov.uk) is the National Enforcement Body for the PRO.