It's not just the CT scanners coming on stream by next year, it's also a relaxation on the liquids rules - no need for a plastic bag at all, and the amount of liquid rises from a maximum of 10 containers x 100ml to 2 litres maxima per each single container. Now if you consider the main cause of secondaries at LHR Flight Connections that is almost the sole cause, given that hopefully knives, guns and what not were picked up at the port of origin. So the check will now focus on dry/vapour explosives, sharp objects and weapons.