And the problem is??
I can buy a PAT tester, and set myself up to test stuff, who is there to regulate what I test or pass? You have come across this, do i need an exam to buy a PAT tester? Does someone go in after me to test my work?
What is the procedure that you have found this shocking fault (literally!); can you trace the person that PAT tested this? Are there repercussions for that person?
I don't PAT test, but on occasion I'm asked to repair stuff, and see nails used as fuses, cut wires, reconnected with chocblocks, as in the picture, common sense says bad practice, and dangerous, but for a PAT tester to pass this? Hmm.