Trying to book a trip from Kings Cross to Edinburgh for some friends on Friday 28th August, preferably 1st Class. Although bookings are now being taken for that date, there are no advance fares available. Can I assume that this is because it's a Bank Holiday and advances will appear once engineering works have been decided on? I don't want to jump in and buy Off Peak tickets at £200 odd the pair if advances are likely to appear later. (much as I enjoy spending other peoples' money ) Any advice appreciated - thanks!