I have to agree, Lyneham would make a very good regional airport, afterall if Stanstead/Luton can call themselves London.... then surely an airport a mere hour from central London could be called London Swindon?
All joking aside, a new motorway junction, running to a large car park at the bottom of the hill(getting rid of the car boot at Dauntsey) add a station on the mainline right next door, and you have a very easy to get to airport in a central location.
Nah too easy, they will obviously go for option 1, give it to the army......