I think we are doing exactly what BIFFA did, interpret the facts incorrectly. There is no mention of the weight being wrong, calibration being wrong. Clearly from the fact they know the actual weight of the bin, that the calibration/weight recording was correct. Because the weight of the bin was irrelevant to how much the customer was charged, it's recording and what and where it was recorded was obviously not important. From the police statement it appears the correct weight was recorded but most importantly in the wrong place, or the person giving the police the info.read it from the wrong place.
While many are heaping huge criticism on the police, if they ask the straight question, what was the weight ?? and are told X .. and are shown a data sheet with X on .. how are they to know that the what was written in 'X' was actually Y !!
What the police have done excellently is go back to basics, re-examine the facts BUT this time not assuming the facts they were given were correct.
As someone who worked on missile systems, laser guidance systems (for bombs), satellites .. there could never be a case of assumption .. assumption for me could mean a missile going off target .. a satellite failing. WE had systems of checking, systems of checking the checks. A guy writing down the weight of a bin when he knew that the info wasn;t needed .. so what if he wrote it down in the wrong place .. and that i think is what happened here, plain and simple.