If they've gone through SBD (symptom based diagnostics, which is basically web based Ford diagnostic program) , there might have been a mandatory PCM calibration, but if out of warranty they should have asked you if you want it doing, not just done it anyway.

Glo-plugs sound about right. On the modern stuff if a glo-plug circuit fault it can put them into limp mode.

They're not the easiest to get to on those engines, so an hours labour is fair imo.