I've worked in ATC for over 25 years, and we've just had EFPS installed here at EGGW. I know we don't have the amount of traffic as EGLL, but then again we don't have the amount of staff or working positions either.
Yes I was sceptical and concerned about the change too, but I have to admit that the system does actually work. It does make life easier and quicker.
EGLL controllers are right to be worried about the change, but they will be surprised about how easy the system is to operate in the real world.
As for the assistants, they have nothing to do now. They are the ones who should be worried about its introduction.