Borrowed from the MSE Forums:
"Lots of rumours flying about just now but from multiple sources with the same basis.
Special delivery. RM will be removing the 1pm guarantee and making it a straight next day product. I'm told this is pretty much fact and will be coming in.
No idea on 9am but assume it will stay.
RM is looking to drop a delivery day. Either Saturday or Monday.
Bets seem to be on removal of Saturday with an overhaul of the Saturday operation making a specific Saturday service slanted to parcels.
This is being touted as a when, not if situation.
Apparently the date for the review of the USO has been brought forward which would tie into this."