To find the correct torque specifications, you must consult a Ford Focus 1.8 TDCi repair manual specific to your vehicle's year and model. These manuals will provide detailed torque specifications for each bolt. Using an incorrect torque value can lead to stripped threads, broken bolts, or even engine damage.
You can usually find these manuals online (some are free, others are paid) or from a Ford dealership. Searching for "[Your Year] Ford Focus 1.8 TDCi repair manual" online should yield results.