Thanks for your time Bob,
I know it sound ridiculous and that it's highly likely nothing to do with the schedule but I checked everything you suggested (Which I have done many times before!), and its all as it should be. In the destination tab of the backup the pool that is selected is the same as the one in Devices and Media. In the Pool the media that has been formatted to run this week is green and there is no protection.
Like I've said it was stuck in pending Saturday gone, I'm going to change to run this Friday (With no changes) and see what happens
Mark
PS We don't have Barcode support enabled