I am a wheelchair user, and frequently travel on GWR between Oxford and London Paddington or Worcester Foregate Street. Much of the time I get put in the first class carriage, and I am never asked to pay for a first class ticket. If I have a companion travelling with me, I presume I would have to pay for a first class ticket for them if they want to sit with me? What sort of ticket would I ask for? They would be travelling from a further out station than me, and have already got a standard ticket.