C'mon people. You all know that Stansted is a runway in agricultural area with low population density. Much of the passenger base uses STN as a transit point while travelling to or from London.
In the early 2000s the railway line between Euston, the Midlands and North West England was either lousy or undergoing major engineering works which translated into often slow or delayed trains. The bulk of the work finished in 2006 with the last bits substantially complete by 2008. Unless offering this as a proper connecting flight, flying passengers between the south east and Liverpool / Manchester is going to really struggle post 2008.