More reasons to avoid Heathrow
I have given up on Heathrow. It is a place to avoid, horrendous taxes and fees, massive long hikes in that "bloody awful place" T5. The contrast with Singapore and Hong Kong where I usually transit it marked. Two of the world's best airports, one of the worst. Even the attitude of the security staff contrasts badly, not to mention the efficiency of border control.
Spend the money on recruiting humans in security and diverting excess traffic to other airports.
Is this system seriously expected to work? Decision making by committee.