1. ”Satistical Release- Provisional Road Traffic Estimates Great Britain: April 2016–March 2017,” Department for Transport (2017)
2. “UK Government GHG Conversion Factor for Company Reporting,” Department of Energy and Climate Change (2016)
3. “National Rail Passenger Survey Spring 2016 Main Report,” Transport Focus (2016)
4. “National Rail Conditions of Carriage,” National Rail (2015)
5. “Cabin luggage: Guide to hand baggage sizes and weight restrictions,” Skyscanner, 21 June 2017. [Online]. Available: https://www.skyscanner.net/news/cabin-luggage-guide-hand-baggage-sizes-and-weight-restrictions. Accessed 21 June 2017