So if the government decides on Heathrow, people living there will be wondering how much their properties are worth, given that the payout is 25% plus market value, assuming of course, it all goes ahead. Using historic Land Registry prices, updated to the lastest month, you can see the relevant postcode sector here – UB7 0 – which I think is the closest geospatial match to the site of the 3rd runway.
Image below – full page and historic property prices here on postcode sector UB7 0.