Lead Balloon, it's nothing to do with industrial relations. Sigh. It's a management imposed structure to centralise the holding of SARTIMEs in a single location to remove that workload from ATC. We used to hold them but TAAATS really wasn't designed for providing anything but a control service and the process we used to hold SARTIMES was not robust.
As a controller I don't have time to go looking for random information on the off chance that you may need it. It's nothing to do with stovepipes and things being hungrily protected. What you're asking for is the reinstitution of ops which was devolved to the pilot many years ago.