Still can't get on. It alternates between this:
"Sorry, we encountered an error when searching for your ticket options
Please try another search"
and the 'high volume of traffic' message.
edit-from the east coast twitter feed:
"Looks like we've ran into some IT issues this afternoon! If you're having trouble booking or collecting tickets, or accessing tickets through the app, have no fear - the Web Wizards are on the case!"
further edit: and when I do get on there are no advances listed for any train on Monday Sep 10th, cheapest offering is a super off peak single for £68.20.
Further edit: having checked, the homepage says weekday tickets available up to Friday 14th September,but no advances released for 10th-14th, yet they are available up to Friday 7th September as I've already booked my outward trip.