Why all the contrails?

Taken at 10.30 am but why so many contrails in such a perfect blue sky? Is it more planes because of the holidays? Malc tells me it is to do with high atmoshperic pressure.
As I wrote this I remembered a reply last year about contrails from Nev
For more infomation you can search for "contrail shadows in clouds" with your favourite search engine or you can also look at this URL for further explanation http://contrailscience.com/contrails-dark-lines-chemtrails/.
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