Clearly luck is a major factor. Outbound T3 05:45 (time at security) Wed 29th through security no queue whatsoever ... found myself directly at the x-ray scanners ... caught me out slightly! Departure lounge was busy as well, plenty of passengers around. Return landing T3 around 20:30 Thu 30th again negligible queue at border control. Aircraft to landside in about 5 minutes. Can't fault any of that.