I can remember a few years back going on a summer holiday, me, my wife, our 6 year old at the time and our year old, and having to open a sealed carton of baby milk and take a swig from it - presumably to prove it wasn't hiding a bomb. Absolutely bonkers.
I`m saying that when the 3D scanners are introduced and you no longer need a liquids bag, you will still need them on the way back into the UK as outstations will not necessarily have the appropriate scanners.