Last year when I went through LHR (T3 and T5, from memory), all electronic devices had to be separately screened and removed from all sleeves irrespective of material (yes, I had to take my iPad out of its Cache). At CDG nothing was separately screened.
I'll be in Hong Kong, Bangkok and Paro (Bhutan) over the next month and will update on my experiences there in case anyone is interested.

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