Perhaps for "Free SR.N4 hovercraft (for Dover-Calais in the same environment) in the Shipyard campaign" ?
Go for that, Stu!
I don't think they will go with the free idea, but certainly SR-N4 is suitable for SSE
1. It adds diversity: SR-N4s are the largest surviving commercial hovercraft in the world, and they have been an icon for many years
2. There is a cause to support: The Hovercraft Museum has the last two SR-N4s in the world, and they are at risk of being bought out by private owners
3. They promote the Hovercraft Museum: That can be no bad thing, especially as at the Hovershow there will probably be lots of potential Vstep customers...
4. it does go nicely with the Dover-Calais environment...