In general, the following rule applies: At least one person must be in possession of a valid ticket for travel (ticket, Day Pass, GA Travelcard, point-to-point Travelcard, modular Travelcard, but not Half Fare Travelcard without a ticket or Junior Travelcard without a ticket).
Example A.
Companion Travelcard and Half Fare Travelcard = one half-price ticket is sufficient.
A person with a disability holding a Companion Travelcardis travelling with another person holding a Half Fare Travelcard. The passenger with the disability travels free of charge and their travelling companion with the Half Fare Card buys a half-price ticket.
Example B.
Companion Travelcard and GA Travelcard = the GA Travelcard is sufficient.
A person with a disability holding a Companion Travelcard is travelling with another person holding a GA Travelcard. The passenger with the disability travels free of charge and their travelling companion travels using the GA Travelcard.
Example C.
Companion Travelcard, Half Fare Travelcard and Junior Travelcard = one half-price ticket is sufficient.
One parent holds a Half Fare Travelcard. He is travelling with two children. One child has a Junior Travelcard. The other child uses a wheelchair and holds a Companion Travelcard. The parent with the Half Fare Travelcard buys a half-price ticket, the child in the wheelchair travels free of charge with the Companion Travelcard, the other child travels free of charge with the Junior Travelcard. The Junior Travelcard is only valid with a valid ticket (in this example, the ticket of the parent with the Half Fare Travelcard).