Just received this from Waterstones

We have been in contact with our suppliers about this and they are currently investigating the error on the eBook with their collection team, once they have more information or when the problem has been fixed we will contact you to let you know. Thank you for your patience and please accept our apologies for any disappointment or inconvenience caused. Kind regards, Gregor McGill Waterstones Customer Service

They have also refunded the cost of the book. Interestingly, I can still download the eBook via Adobe Digital Editions. Wonder what happens when / if there is an update?