The technical file is not the same as the owners manual. The technical file is the working document used by the "builder" to prove compliance with the RCD and supporting standards and needs to include all drawings, calculations, test reports and CE documentation of all components used. The technical file should be retained by the builder, I think for 10 years, and the courts / HSE can require the file to be handed over in case of an accident.
The owners manual is not so detailed and is given to the purchaser for operation and maintenance purposes.
Paul