Is what I would assume but this one seems an odd case. As I said, the very rear coach of the Plymouth portion is a Slip coach for Reading, so that obviously needs to stay on the rear once the complete formation has left Newton Abbot.
As given leaving Newton Abbot;
As given leaving Newton Abbot;
LOCO
Paignton Portion
Van Third
Third
Composite
Composite Brake
Plymouth Portion
Van Third
Dining
First
Third
Third
Van Third
Reading Slip