The fact that they are US citizens calling from abroad does raise an issue that has yet to be resolved. How can it be determined that the person abroad happens to be a US citizen?
But the real problem- highly impractical- is the proposal to take measures to control internet communication (Skype, email), as the Guardian points out.
The ammount of hard drives you would need to record the data for this would put a severe crimp on the UK ever meeting its carbon emissions targets. Any idiot can face a crisis - it's day to day living that wears you out.
