Friday I posted a letter (Special Delivery by 1pm) and was hoping it would be delivered on Saturday; however, it hasn't been. It now appears to be at one of Royal Mail's mail centres and stuck on "Ready for delivery." "Your item was received by the mail centre and is now due for delivery today", which of course it won't be as it is now Sunday. If I click on "Update delivery options," it says that no options are available.