Seperation of Arriving and Departing Passengers
Why do some EU countries quite happily not need to do this? Transiting AMS and GVA this last month the vibe is actually way less stressful.
With appropriate border controls in place, why in the UK do we have 100s of stern looking security types in dayglo yellow opening and closing glass doors as needed to keep us apart from our fellow travellers?
They are allowed to mix freely at T1 and T5 at Heathrow with a photo check preventing undesirables getting onto a domestic flight to bypass the UK Border check. What is the huge danger of allowing the two flows to meet?