Virgin fly from the South terminal. If you are staying at the Gatwick Hilton you can walk straight through to the South terminal. Depending on when you are going Virgin also offer a evening check in. Give them a call and they will let you know
yep, virgin fly from the south terminal so the hilton is the most convienient hotel
but Le Meriden hotel is located right next to the north terminal just like the hilton hotel is and it only takes 2 or 3 mins to get to the south terminal using the free tram/train thingy and is slightly cheaper than the hilton
i've not stayed in either hotel mind just so ya know