Upgrading with miles/cash at airport

Husband and I are booked in PE from LHR to DEL in March.
I am FC Red and have 27,000 miles which is enough to get me an upgrade to UC one way.
I asked the flying club whether its possible to upgrade my husband too using the remaining 7,000 miles I have (will probably have about 10,000 by the time we travel as I have a Virgin credit card) and they said that this wasn't possible but to ask at the airport.
Where is a miles promo when you need one !
Has anyone done this at the airport and have any idea how much it might be. Not sure what fare class we are in as it was booked through Kuoni but it is upgradeable without extra cost plus 20,000 miles one way to DEL. I think she mentioned fare class S but not sure.
Any advice greatly appreciated. Am tempted just to upgrade me and leave hubby it PE but that would be mean [}:)]
LTH
I am FC Red and have 27,000 miles which is enough to get me an upgrade to UC one way.

I asked the flying club whether its possible to upgrade my husband too using the remaining 7,000 miles I have (will probably have about 10,000 by the time we travel as I have a Virgin credit card) and they said that this wasn't possible but to ask at the airport.
Where is a miles promo when you need one !
Has anyone done this at the airport and have any idea how much it might be. Not sure what fare class we are in as it was booked through Kuoni but it is upgradeable without extra cost plus 20,000 miles one way to DEL. I think she mentioned fare class S but not sure.
Any advice greatly appreciated. Am tempted just to upgrade me and leave hubby it PE but that would be mean [}:)]
LTH