Can Gold FC members use fast-track security on non-VS flight

I'm not expecting to be able to use VS's LHR private security channel but can you use the fast-track security lane at LGW/LHR on non-VS flights by showing your FC gold card?

I would very much doubt it

[Neil]

No, not unless you have access granted by the airline you are flying.
Your FC gold benefits are for when you are flying VS or one of their partner airlines.