a little help would be great...

Hi,
2 questions.
I'm flying to LA on Monday. I'm flying BMI to London from Manchester, then getting on VS07. What's the earliest/latest I can check in for the BMI flight as i'm travelling internationally on the connection or doesn't it matter?
Also Because i've got 5 flights on my book ref. Which means I can't log on to the Virgin 'Check my booking' which I think is...stupid and should be sorted out. So i've requested my seat with The Flight Centre (who i made the booking with) will this stand or will other people get choice of it as they've chosen through the online check in over me?
Thanks in advance for any help.
Elis
2 questions.
I'm flying to LA on Monday. I'm flying BMI to London from Manchester, then getting on VS07. What's the earliest/latest I can check in for the BMI flight as i'm travelling internationally on the connection or doesn't it matter?
Also Because i've got 5 flights on my book ref. Which means I can't log on to the Virgin 'Check my booking' which I think is...stupid and should be sorted out. So i've requested my seat with The Flight Centre (who i made the booking with) will this stand or will other people get choice of it as they've chosen through the online check in over me?
Thanks in advance for any help.
Elis