From
Business Traveller
... [T]ravellers flying out of Heathrow and Glasgow airports must once again remove their laptops from hand luggage when passing through security, following the end of a trial by The Department for Transport.
The two BAA airports had been granted permission to allow their passengers to leave laptops inside hand luggage, but this special dispensation has now been removed while the DfT evaluates the results of the 18-month trial.
I suppose it was beyond the wit of the DfT to start evaluating after, say, 12 months, so the trial could have moved smoothly on to allow laptops as a routine?
Ll