Certificates and competence do not go hand in hand, some good doctors and some bad, both more or less have the same qualification. NVQ, National Vocational Qualifications are given out like confetti, we called them, Not Very Quick's, one cannot fail an NVQ, the more a training company passes the more money there is to be had.
All one has to do is drive on any road in the UK and you will see that having something like the old paper and now plastic driving license that says you can drive competently is all just a load of bullshit. Certificates or Qualifications now days I am sorry to say