EZYboy,
Your information is correct (to a point). I worked with a couple of girls at KLC based in NCL, they both previously worked for Virgin. They had to stay in the London area for their first year-6months of their contract but after that they were allowed to move back to NCL and commute for there Check-ins.
I believe a fair few companies based at LHR/LGW allow their staff to do this.
Rooster
Happy Flapping