^^^ When i had my interview with VS they said 7-10 days in the post as well to me.
So imagine my surprise when a couple of days later i got a couple of calls from others in my interview group saying they'd had a phone call offering them the job!!
I thought well that's that then - i haven't got it! But a few days later the big envelope landed on my door step offering me the job!!
I don't know why they do this although my friend swears blind it's because they know you all swap numbers and want to play a game with you all!!
PS - With Virgin if they're offering you a job you'll get sent an A4 envelope, if they don't want to hire you, you'll get a normal sized envelope.
They still do it now 6 years on from when they hired me!