Virgin Holidays is an upgrade possible?

Hi, I have a few questions which I'm sure have been answered individually but not sure if I put all the scenarios together things might change!?
Anyway, I am off to Barbados and have booked through Virgin Holidays and I am flying PE out and Upper Class back. I am using the Club House at Gatwick on the day of departure as well. I wanted to upgrade to UC on the outward flight but was told that I couldn't upgrade as there were no seats left in UC.
Friends we are travelling with booked their flights separtely and have got UC seats and when choosing their seats said that all but 4 were available. I understand that maybe Virgin Holidays only have a specific quota they can sell but here comes my question...
When I'm in the Club House am I more likely to be able to get the oportunity to upgrade through the concierge? I'm not after anything for free, I'm happy to pay or even using my airmiles? Also as I booked through Virgin Holidays I'm guessing that my ticket won't be a flexible one and the upgrade would be dependant on this?
I'm also a member of the Frequent Virgin Program operated by Virgin Holidays if that may help?
Any advice would be appreciated.
Cheers
Tom
Anyway, I am off to Barbados and have booked through Virgin Holidays and I am flying PE out and Upper Class back. I am using the Club House at Gatwick on the day of departure as well. I wanted to upgrade to UC on the outward flight but was told that I couldn't upgrade as there were no seats left in UC.
Friends we are travelling with booked their flights separtely and have got UC seats and when choosing their seats said that all but 4 were available. I understand that maybe Virgin Holidays only have a specific quota they can sell but here comes my question...
When I'm in the Club House am I more likely to be able to get the oportunity to upgrade through the concierge? I'm not after anything for free, I'm happy to pay or even using my airmiles? Also as I booked through Virgin Holidays I'm guessing that my ticket won't be a flexible one and the upgrade would be dependant on this?
I'm also a member of the Frequent Virgin Program operated by Virgin Holidays if that may help?
Any advice would be appreciated.
Cheers
Tom