The undertaker must not exercise the powers conferred by articles 19 (authority to survey and investigate land), 20 (compulsory acquisition of land), 22 (compulsory acquisition of rights), 23 (private rights over land), 25 (acquisition of subsoil or air-space only), 27 (rights under or over streets), 28 (temporary use of land for carrying out the authorised development), 29 (temporary use of land for maintaining the authorised development), 30 (statutory undertakers), or the powers conferred by section 11(3) (powers of entry) of the 1965 Act in respect of any Heathrow Airport property unless the exercise of such powers is with the consent of Heathrow Airport Limited.

The undertaker must not in the exercise of the powers conferred by this Order prevent pedestrian or vehicular access to any Heathrow Airport property, unless preventing such access is with the consent of Heathrow Airport.

The undertaker must not under the powers conferred by this Order acquire or use, or acquire new rights over, any Heathrow Airport property except with the consent of Heathrow Airport.

Where Heathrow Airport is asked to give its consent or agreement under this paragraph, such consent or agreement must not be unreasonably withheld but may be given subject to reasonable conditions which may include the requirement to give indemnities or undertake protective works necessary to protect Heathrow Airport property.