Ok, a bit of a vent from me, but also a warning to others who may not be aware. In March this year, I purchased The Walking Dead: Compendium One from the iBooks store for about £30. After doing a clean install of iOS8 on my iPad I went to the iBooks app to download the book from iCloud. All my other books were there but The Walking Dead was not. I contacted Apple, and advised them of my order number and receipt that I found in my purchase history. A lady responded and said that they are sorry but it is no longer available to me as it's been modified in the store. So be aware people that purchases from iTunes/iBooks will not always be there despite iCloud touting that they would.