No longer able to purchase books and can only buy one credit @ £8.99 in the app. No reason given in the email sent to explain. You have to go to website now, where you can at least get the credit X 3 @ £18 still and purchase single books. After a search it's being stated on web that it's the 30% app stores charge after the first million, 15% below, that's the reason. So it would appear someone doesn't want to pay that much. Seems shortsighted on both sides to choose profit v retaining customers.