It kind of caps what has been quite a drop-off in service following the switch to the new distributor.
As I've already stated in the thread for Prog 2004, there is no new distributor. The subs copies are sent directly from the printers, and have been for the last 2-3 years. They're mailed out on the Thursday, to arrive Saturday. Sometimes problems at the printers can mean they leave a day late, and that can knock arrival past the weekend.
No change in policy, no change in method. I can only put the unfortunate recent lateness of your prog's delivery down to a localised Royal Mail issue.