Look the only way we can legally make airlines to use the Thames Hub airport (THA) is to close all other airports in the area, if we just close LHR, then
BA
There is no such code as (THA)...Making an imaginary code won't make a pie in the sky airport any the more realistic.
Who is going to close all the London Airports?..Boris?..He has no veto, so he is out of the equation.
The government has all but said LHR (a proper code) will be expanded, just the Liberals temporarily holding them back.
There is no airport going to be built in/on a river, for a start it would be to expensive, another reason, it would not attract investers who would never see a return for their money.