But ONLY for cash, unless the wording has changed.
Yep. Realistically putting 10p in was to prevent the local scallies holding the button down and dumping the whole roll on the floor.
Not only for cash, no.
If the ticket is not available from the machine : think PRIV, ranger, rover, daysaver, DUO in some instances, then you can pay by any method, as is only right and fair.
Similarly, discretion is exercised when the ticket is complex : think routings, time restrictions - or expensive - Its a big ask to expect people with no ticket training to trust themselves to get it right on expensive, long distance tickets. Such discretion is expected to be exercised by ALL revenue staff, and is briefed out as such.
So yes, the wording is cash only.
But nothing is ever black and white.
So no, not only for cash.