@Jezson – As Jamie says there are still quite a few seats left, the full current entry list is below:
McLaren
1. John Brookfield
5. Moussa Awada
x0 Free Seats
Lotus
3. Oli Peacock
4. Bradley Downton
x0 Free Seats
Williams
6. Ben Moody
x1 Free Seat
Red Bull
x2 Free Seats
Ferrari
x2 Free Seats
Mercedes
x2 Free Seats
Renault
x2 Free Seats
Force India
x2 Free Seats
Sauber
x2 Free Seats
Toro Rosso
x2 Free Seats
Virgin
x2 Free Seats
HRT
x2 Free Seats