Overview
- Prime Minister Andy Burnham, who on Wednesday refused to confirm support for the third runway, has left the project politically unclear and split ministers over the plan.
- Heathrow chief executive Thomas Woldbye has warned that without a clear government pledge private investors may pull money out and invest overseas.
- Heathrow says it aims to seek planning permission by 2029, expects to file a formal planning application within a few years, and now accepts the runway may not open until about 2039.
- Rival ideas to limit cost and speed delivery include Surinder Arora's two‑phase 'Heathrow West' plan and examples from iGA Istanbul, both of which propose opening a shorter runway first.
- Major hurdles remain, including contested cost estimates (reported between about £33bn and up to £49bn), climate and legal challenges, and local works such as rerouting the M25 that would affect nearby communities.