It's been a long day, I'm going home. Swap accuracy & precision throughout the final paragraph, it makes sense then

>P.S. George - my client can be very fussy, I have had discussions regarding the lack of accuracy in my figures & them want me to convert all of my calculations to be accurate to 3 dp. What we're talking about is 1/5th teaspoon of liquid in 200000 litres, when their precision of measurement is +/- 20 litres.