Anomoly
My C6 bus driver wasn't having a very good morning today; for a start it was foggy with a visibility range probably measured in double-digits of yards, and secondly his ticket machine wasn't working.
He sold me one of these. My subsequent P&R driver was a bit snotty about it, but he did let me on the bus. (He said that the C6 driver shouldn't have sold me a Dayrider; but only a single.)