Were are the glow plugs on ford 2.0 tdci engine?

On a Ford 2.0 TDCi engine, the glow plugs are located in the cylinder head, one for each cylinder. They're individually accessible, but buried within the engine's top. You won't see them without removing some engine components, like the intake manifold and possibly other parts depending on the exact year and model. You'll need a specialized glow plug socket to remove and install them. Their exact placement will vary slightly depending on the specific engine code (e.g., Duratorq-TDCi variations), but they're always in the cylinder head itself.