If an item is out of stock when you return to the product page, it means the available stock has unfortunately already been purchased by another customer.
Please be aware that there may be several customers waiting for the same item. When new stock arrives, all customers registered for a notification are emailed in the order in which the notification was registered, and the item is then available on a first come, first served basis.
Once you’ve received a stock notification, you’ll need to register again if you’d like to receive a further notification when more stock becomes available.