There's a pair of paths to each of Derby Litchurch Lane and Wimbledon Park, one ROG and one GBRF. The Derby path from GBRF didn't run yesterday, the ROG is running today. After hitting Litchurch Lane it goes back to Bicester tonight for the Wimbledon path tomorrow. I'd guess that ROG is offering better commercial terms and their paths will run with the GBRFs one unused.
The 5Q30 Eastleigh 701/0 delivery looks to be today not tomorrow:
Realtime Trains is an independent source of live realtime running information for the Great British railway network.
www.realtimetrains.co.uk
Edit: The Eastleigh one is on the move, the ROG path to Derby has been cancelled though loco arrived. Maybe only doing the Wimbledon delivery tomorrow