It has been reported in the Liverpool Daily Post this week, that LJLA have been in talks with a number of airlines exploring the possibility of London flights, Iwould guess at Jetmagic into City or Easyjet into Gatwick, can't see Bmi hav,in a bash at it.
Little Blue, yes your right it has been tried before back in the 90,s /80,s when the airport was on its knees, but things are on the up in the this neck of the woods , and Iam sure that a great City the size of LIVERPOOL can now support this route.