Not exactly. They run some of the Corbys. Here are the full diagrams (there are only two). Diagram one is different on Mondays than it is Tuesday - Friday.
4 Car Pioneer Diagram 1 (MONDAY ONLY)
1C06 0517 Derby London St Pancras
1M11 0800 London St Pancras Corby
1P34 1114 Corby London St Pancras
1M36 1300 London St Pancras Corby
1P54 1443 Corby London St Pancras
1F56 1700 London St Pancras Derby (9-cars to Kettering where it splits with 4 to Derby)
4 Car Pioneer Diagram 1 (TUESDAY-FRIDAY ONLY)
1D09 0730 London St Pancras - Nottingham
1B31 1002 Nottingham London St Pancras
1F33 1225 London St Pancras Derby
1C57 1518 Derby London St Pancras
1D59 1730 London St Pancras Nottingham (9-car formation)
4 Car Pioneer Diagram 2
1C17 0647 Sheffield London St Pancras (9-car formation)
ECS to Cricklewood
1M46 1500 London St Pancras Corby
1P64 1643 Corby London St Pancras
1D67 1915 London St Pancras Nottingham
1B89 2128 Nottingham London St Pancras