The revised deal has been accepted by Spanish company Ferrovial, Heathrow Airport's largest shareholder, according to a statement released on Friday. The Paris company Ardian will receive 22.6% of the shares, and the Saudi Public Investment Fund will have 15%. Ferrovial will remain a shareholder with a 5.25% stake, according to the statement.

The new deal will cover so-called "accession rights", which gave other shareholders the right to join Ferrovial after the original deal was reached in November. At the time, the Spanish infrastructure company said it was selling its 25% stake to Ardian and PIF. The Saudi fund was to buy 10% of Heathrow's parent company, and Ardian - 15%.

Other shareholders subsequently exercised their right to sell part of their shares.