Madeleine McCann hotel staff in the Algarve left a note in a message book that left her mum Kate filled with 'horror' she revealed.
Kate opened up in her book, ' Madeleine : Our daughter's disappearance and the continuing search for her' about the discovery.
After the missing tot disappearance in 2007, Kate was granted permission to view the note as part of police files.
Madeleine, affectionately known as Maddie, would have been 18 this year, Birmingham Live reports.
Maddie vanished from the Algarve resort in May 2007 and this year marks her 18th birthday.
Kate previously wrote: “It wasn’t until a year later, when I was combing through Portuguese police files, that I discovered the note.”
Kate continued: “The note requesting to get a block booking was written in a staff message book, which sat on a desk at the pool reception for most of the day."
Kate added: “This book was by definition accessible to all staff and, albeit unintentionally, probably to guests and visitors, too.
“To my horror, I saw that no doubt in all innocence and simply to explain why she was bending the rules a bit, the receptionist had added the reason for our request: we wanted to eat close to our apartments as we were leaving our young children alone there and checking on them intermittently."
She added "we now bitterly regret" this decision, and "will do so until the end of our days".
Kate, from the East Midlands, has vowed never to give up searching for her daughter, alongside her husband Gerry, with the pair recently marking Maddie's 18th in quiet fashion
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