Hi Lisa
Congratulations on getting an interview, as they explain on the day it's and achievement to get that far!
If you get to the south terminal and go over to the virgin check in area right at the end on your right as you look at the bank of desks you'll see some doors and above it will say To Concorde House, go through and down the stairs and concorde house is opposite.
As for the day it's very straight forward really, firstly they will measure you to make sure your over 5'2. Then you will introduce yourself, then have read to the group some info off a laminated card. One group exercise, then the maths and english test's. After all that is the 2:1 interview. But I would say that throughout the day the recruiters make you feel very relaxed and comfortable and make it fun!
As for what Virgin are looking for, that really is the million dollar question! Just be yourself and enjoy the day, that's what seems to work!