Upon return to the UK a few years ago I sent my SA Matric to the official education board for assessment!
The result being that SA Matric exams passed in higher grade was equivalent to A level whereas standard grade was equivalent to O level.
In the UK depending on your age it is probably wiser when applying for a job to include in your CV accordingly, ie: 5 higher subjects= 5 A level etc, the interviewer will relate to the assessment.
Hope this helps
sandy young