(28 Dec 2014, 9:20 pm)John_R wrote Yes, but it wasn't a commercially viable service. Having said that, you can get a Arriva 1/X1 day saver (Darlo-Bishop) for only £4.20 (£4.30 in 2015), which does make the X66 look overpriced.

It would have been, if Arriva didn't provide such strong competition at the time...

There's advantages and disadvantages of competition - the downside to competition in the OK1's case is that it was withdrawn completely and customers who used that service had to find alternative methods...
Of course, the resources were pumped into a competing service on the Tyne Valley corridor, and Arriva carry far fewer passengers now for the same reasons as Go North East did on the OK1!