My daughter's boyfriend, travelling on Arriva Valley Line for the first time, arrived at Caerphilly station, just as a (late) train arrived. As he approached the ticket window, the guy behind the window said "get on the train". He didn't see a guard on the train, and on arriving at Cardiff central went to queue to pay, but was approached by the ticket enforcement guy and subsequently threatened with prosecution. He has been offered a deal whereby he pays £69.50 to avoid court proceedings. SO - beware of entrapment policy of ARRIVA!