We all now that the mobile networks fall over when big things happen, and a lesser known fact is that The Scotland Yard can jam the phone networks in a huge area of Central London so their radio signals can get through.
I'm not sure how it works though...
So don't be too worried just yet. London is rather large and chances are that they are fine.
So far I only have one friend left to check up on.
Getting home is gonna be a bloody nightmare though.
A 5 hour walk or something like that.