As a student, it is not your right to question the professional judgement of your lecturers. The University, the Office of the Independent Adjudicator and the courts will not interfere with what they call 'academic judgement' (i.e. a lecturer's judgement about a student's academic performance).
However, if you can show there has been procedural or other irregularities in the assessment process (e.g. something other than academic judgement has crept into the assessment process), you can use the academic appeals process to request a remark.