I am considering taking the temporary Settle and Carlisle shuttle from Preston to Carlisle and back for the ride. Provisionally looking at times for 13th April, I find Real Time trains showing a departure from Carlisle at 18:04. This website and splitticketing.com offer that train but Avanti's own website and redspottedhanky.com don't offer it. How does this happen if they're all using the same underlying database?