UPPER CLASS Upgrade.. please help

Hi All,
I was wondering if somebody could please help me out. Im travelling LHR-DXB this sunday(13th)on the VS400 and am currently in W. I used miles for this ticket and managed to get J on the way back however outbound G seats were sold out even though i was told that there's lots of seats in J available. They told me to keep trying. Ever since november i have been looking daily but no seats ever appear to be released.
Can someone please tell me how many seats there are in upper free for this flight. Ive had a look on flightstats and it appears wide open but am baffled as to why no G seats are being released.
If worse comes to worse what are the chances of me getting a J upgrade using miles if i ask at the airport on the day of departure? Anybody had experience at this?
Any help would be much appreciated.
I was wondering if somebody could please help me out. Im travelling LHR-DXB this sunday(13th)on the VS400 and am currently in W. I used miles for this ticket and managed to get J on the way back however outbound G seats were sold out even though i was told that there's lots of seats in J available. They told me to keep trying. Ever since november i have been looking daily but no seats ever appear to be released.
Can someone please tell me how many seats there are in upper free for this flight. Ive had a look on flightstats and it appears wide open but am baffled as to why no G seats are being released.
If worse comes to worse what are the chances of me getting a J upgrade using miles if i ask at the airport on the day of departure? Anybody had experience at this?
Any help would be much appreciated.