How many runways for Heathrow ?

[wirralbus]

RE: How many runways for Heathrow ?
You say starting on a new site , would this site be where Mr Boris Johnson wants it to be in the Thames Estuary or somewhere completely different .

If you was to build Heathrow now in this day and age you would require at least 4 runways , 2 East / West and 2 North / South , you would have to ensure they didnt crisscross each other as well for maximum flexibility.