http://www.telegraph.co.uk/news/2016/08/05/bbc-to-deploy-detection-vans-to-snoop-on-internet-users/
!!!! BBC packet sniffing party van coming to a Wifi network near you soon.
Have they cracked WPA2?
edit:
Just read it a bit more. So they will look at the size and frequency of wifi packets.
Surely both of those are determined by the router itself and the speed of your internet connection.
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