AG has a valid point re.3rd runway being less than optimal.
What might be worth considering is taking a look at the bigger picture, factor in capacity across the South-East and if there is potential to re-locate slots to other airports, give appropriate incentives to do so.
Ramp up rail links and/or road networks to offset the extended journey times, this extra capacity also has benefit to the wider community.
IMO, LGW needs another runway before Heathrow.