If chemtrails are indeed harmful chemicals vented on to unwitting members of the public, why are they seen over parliament daily in the UK? Why would the government of Britain be spraying themselves in toxic chemicals? Oh perhaps it's the natural vapour from aircraft flying into two of the busiest airports in Europe, Heathrow and Gatwick?
I think people of the USA have a better theory, making people ill so high tax paying medical insurance companies boom, due to rises in emergency room attendance. But that doesn't really wash in the UK. Making the people of Britain purposely sick and putting heavy demand on the NHS does not really benefit anyone. Taxes would rise and so would unemployment which are two ingredients for a crippled economy.
There's just not enough logic behind the reasoning for chemtrails to support a tangible conspiracy theory in my eyes, sorry guys!