Boris Johnson challenges party's pledge to build a third runway at Heathrow

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Senior Tory Boris Johnson today challenged his party's manifesto pledge to build a third runway at Heathrow Airport.

Mr Johnson, who hopes to be re-elected as Conservative MP for Uxbridge & South Ruislip was meeting voters in the Labour-held marginal of Brentford & Isleworth.

The former London mayor told ITV News the runway would be 'very difficult to deliver' because of noise and pollution concerns.

Foreign Secretary Boris Johnson Credit: PA

His comments were echoed by Shadow Chancellor John McDonnell. Both men represented constituencies affected by aircraft noise.