For the past couple of years I have used the WTWC booking for my journeys to London. I often use the cheaper fares/slower journeys link to reserve a seat on the first off peak journey. Today when I try and do this I just get an N/A result. This seems to be the same for any journey in the country at any time of day e.g. Leeds-Newcastle. If I deselect the Senior Railcard the screen works normally. I have also tried a second web site which unsurprisingly gives the same result. Has anyone got any ideas about how might get around what seems to be an obvious software bug?