The plan was to put in a parkway station at the point where the existing track passed closest to the airport. This was at the junction of the A299 and A256. Shuttle bus then took pax to and from the terminal just as Luton Airport operates now.
As I pointed out in a previous post, the cost would have been passed on to local developers via the S106 mechanism. The airport was a substantial employer and any growth would have added to the employment levels. Both local and county councils were fully onboard with plans to grow the airport.