pilotwolf - I think you are following an argument out of instinct rather than rational analysis. e.g. assuming that the previous claim of CAA involvement is true, that commercial airliners avionics is more susceptible to RF interference than light aircraft, etc.
Think it through. The industry nor the regulators feel that powerful, transmitting, mobile phones are a sufficient threat to be worth scanning for (the equipment to do that is available).
The industry and the regulators are happy for less powerful, transmitting, WiFi to be used on aircraft. (ref: Connexion by Boeing).
So, given that, do you really believe that non transmitting electronic devices are a safety factor? If you do, then I can guarantee you that you have compromised that view every time you have flown in the last 20 years.