I agree. Both Birmingham and Southampton are just over an hour away by train and an upgrade could bring this under an hour. For those living in the suburbs, the journey time would be even less.
I repeat my earlier post in this thread; stop and think how many runways London has within an hour of central London. The answer is a very high number, more than adequate for London’s needs. The issue is that they are scattered all over London. For point to point travel that is benefit as it allows passengers to choose the most convenient runway. For transfer passengers, it is an issue but only if all airlines insist being in the same place. I am still not convinced that it is necessary to do this.