"Robin May" wrote in message
...

I was issued a proper 'Switch' (not Solo) card well before I
turned 18. I also had a Visa Electron from 16, which I believe LT
ticket machines *should* take.

You stop being able to buy child tickets at 16, so there's no
problem
with ticket machines taking those cards but not offering child
tickets.

What about an adult wanting to buy a child ticket on such a card?