I should have said that after 37 circuits you are then on bonus : £2.50 per circuit. One "tester" tested 70 circuits in a hospital yesterday. He earned £100 for a days work plus 33 x £2.50 = £82.50 bonus... Times that by 5..... Thats why it's being done like that !!
If he did this in an 8 hour day he certainly didn't fully test and document the results of 8.75 circuits / hour (6.87 minutes / circuit) and I doubt he could get anywhere near 70 circuits in a 12 hour day doing it properly and not having a results sheet that is not a work of fiction