When I initially went to book these tickets, the cheapest

seats that I could secure were going to cost in excess of £160. I left it for a few weeks and tried again. Low-and-behold, suddenly a split-ticket arrangement on our preferred train was under £90 for the pair of us. Obviously, a tranche of fresh seats had been released as the early ones had not all sold. So, it goes to show once again, the crazy situation with regard to the UK rail ticketing arrangements that leads to the unknowing general public being relentlessly ripped off.