Not convinced this would be because of anything to do with HS2, most customers arrive via a chauffeur. When night-time restrictions were in place in the wee hours around London, SEN did well as did BHX to a lessor extent but some of that was slash & dash traffic not demanding bigger facilities. Are they strapped for Apron space?
Perhaps you have heard about a project in Birmingham Alabama, I'm sure they would like to get in there rather than Huntsville?