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Heathrow Unveils £49 Billion Plan for Third Runway and M25 Tunnel

Ministers will review the expansion this summer after Heathrow demanded clear government assurances on planning rules or regulatory hurdles

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Overview

  • The proposal includes a 3,500 m third runway, an M25 motorway tunnel and the modernization or demolition of older terminals.
  • Heathrow plans to fund the entire £49 billion project with private investment and is pushing for stable Civil Aviation Authority fees to secure financing.
  • Post-expansion capacity is projected to reach 756,000 flights and 150 million passengers annually, up from 83.9 million last year.
  • Finance Minister Rachel Reeves backed the runway in January, saying it could create up to 100,000 jobs and boost UK investment, and Transport Minister Heidi Alexander will scrutinize the plans over the summer.
  • London Mayor Sadiq Khan and local residents oppose the expansion over concerns about noise, air pollution and the impact on the city’s climate targets.