None of the below was true, don’t waste your money on a First Class train:
"First class gets you wider seats with more legroom, fewer families & kids and more businessmen & laptops. You'll get complimentary food and wine served at your seat on weekdays, although just tea, coffee, sandwiches & biscuits at weekends."  FALSE!
We did use the Flex pass, a lot. It was nice to jump on any train at any time and go. We took a total of 19 trains. We had wanted to go and spend two days in Scotland and two days in Wales, but there were no trains to Wales over that weekend?!? Engineering problems they said. I had non-refundable reservations in Wales that I had paid for, but they gave the money back as we could not get there.
So we enjoyed four days in Scotland!!!