You all seem to have bought into the lhr propaganda that they are the sole airport for business. Expanding lgw will provide the competition the uk needs to keep airlines prices down. EasyJet will not be able to offer the same low fares from lhr as it will along with other airlines, have to foot the bill for that extra lhr runway along with the taxpayer. The bill is a lot lower for expanding lgw and no cost to the taxpayer.
Easyjet want want to charge low fares at LHR, they will be looking to high yielding passengers. Just like DY and FR will.