Sometimes when booking tickets via the Grand Central websites, users will receive the following error:

This is caused when a user tries to book a seat reservation which is no longer available. Sometimes in our booking system our accessible seats can be included in the selection of seats available for reservation, however they cannot actually be reserved, causing the above error.

If you receive this error, it usually means that there are no more reservable seats on that service and you will need to either purchase a flexible off-peak/anytime ticket or take an alternative train. For weekend travellers we publish a biweekly update on the availability of unreserved seats on our Twitter feed.