I was able to click back and choose cities for coach until about 19:50, then get the holding page. Inspecting the source showed no connection however...
At 19:55 my session timed out - 'TIMED OUT We're really sorry, but unfortunately it looks like your session has timed out and is no longer available.'
Not sure if this means it is better to keep that session (back and submit) or to flush and try again... anyone have any ideas?