Concessionary passes or in England, it's called the 'older person's bus pass' or the 'disabled person's pass' can be used on journeys up to High Wycombe from Oxfordshire. For journeys beyond High Wycombe to London, the standard Oxford Tube fares apply.
Passes can be used between 9.00am and 11pm on weekdays and all day on weekends and bank holidays
In London, concessionary pass holders can travel between London Victoria and Hillingdon free of charge with their card.