Eh, it's just to force you not to use paper tickets and clog the machines. If yo...

przemub 39 days ago | parent | context | favorite | on: TfL's simple pop-up message led to a significant d...

Eh, it's just to force you not to use paper tickets and clog the machines. If you want to pay with cash, you're supposed to buy an Oyster card (£5) and top it up at the machine or most convenience shops across London.