This terminal will be used by BAe/EADS contractors on the bmiR shuttles to Bristol/Hamburg/Toulouse/Farnborough and perhaps a Wales PSO connection to Cardiff.
Right now none of those are offered to the public however capacity on the first three and last could be available.
Could see Edinburgh at a push but a service to London ( that covers costs) not a chance.
City was pulled from LPL/MAN under VLM when the West Coast upgrade completed as uneconomic and both those cities have substantial numbers going into the City and across London every day.
As for holiday charters that market is in terminal decline at the UKs main base for these just 35 miles away.
The flexible fares operators already have split presences in the region and the chance of a hub carrier is next to none existent.
As said even KLM couldn't make Speke work and they operate into almost every other field with a shed (Terminal) across the land.