It helps that you read to the bottom of a post. You should not try to manipulate what other posters say. I have never said anything about an extra short runway at LHR, just a runway capable of accepting the largest aircraft likely to land at LHR in case of emergency, though not for regular use.
All this you know as you try to parry comments that are uncomfortable for you.
Six hours closure is no issue for a runway. Are you trying to say that the good people of Sheerness or Southend would not be bothered by aircraft movements at 04.00hrs. over the waters of the estuary? -of course they would because sounds carry much more over water, and at night, so the bother would be greater.
As I said the capacity issue is solved by expanding Luton, as well as LHR and LGW. Do not try to manipulate my comments.