In the UK/Europe, policy varies with laptops. sometimes in, sometimes out. On some occasions I get it out, only to be told not to. I recently asked, at security, and was told, it depends how thick the case is that the laptop is in. That is, if it contains many other items on top of the laptop, then it may need to come out.
As regards security at any airport, what they need is more staff.
I have said it before, if everyone at LHR was 'ready' with laptop out and coat in hand, all that would happen is staffing numbers would be cut. The queue would till remain.
It's about maximising profits see...