I think that was an excellent post by carbuncle.
If the bin weight was 109kg, then someone could have misread that as 10.9, which would then have been rounded to 11kg, the number we were originally told.
My concept would be an onboard system that would read the bin ID and then automatically add the weight for later input to a computer at the 'home base', and these numbers could then be compared with weighbridge results. This way, Biffa could have just given the police a readout which clearly gave the actual weight, with no human writing numbers down in the dark or maybe semi-legibly as they're in a rush or accidentally missing or adding a decimal point. This would have saved the investigation months and they could have been doing the landfill search back in November or December (assuming the cost would be covered).
But that doesn't help a bin driver? I don't think there's a complete solution to this. Before the bin's tipped the onboard system could run a check if it was filled with averages for each bin, which would have to be downloaded from the home base system and updated regularly, and then anything more than xx kilos over the average could flash a red light to the driver to have a good look inside.
But what if someone's thrown a baby in a bin? You're never going to catch everything. A baby's weight would be within tolerance even for a recycling bin. And it's an expensive solution to have this system on every lorry -- credit to Biffa for the existing camera system if it's actually being used by the drivers, and I believe it's caught at least one person in time to save him.
I don't know. What if someone had thrown an old sofa in the bin as a way of flytipping it and the police had spent 3 months searching landfill and Corrie was somewhere else? Even if they'd had the correct weight at the outset, they had to investigate other things as well. I expect the 'bin industry' (waste management industry?) will have an inquiry or something after this and see if there's more that they can be doing, but I can't really see this as a time for recriminations or searching for someone to blame.