The Heathrow Express Railway Extension Order 2002

12.—(1) Before commencing construction of so much of the works as will or may affect the protected property the undertaker shall, at its own expense, appoint in the joint names of the undertaker and the relevant oil company a reputable firm of chartered building surveyors or chartered engineers to prepare a schedule of defects existing in the protected property and that firm shall submit a copy of the schedule to the undertaker and the relevant oil company.

(2) After construction of the works and at the written request of the relevant oil company a similar schedule to that prepared in accordance with paragraph 12(1) above shall be prepared by and at the expense of the undertaker in consultation with the Surveyor, but no such request may be made later than at the end of two years from the date of opening for public traffic of the railway comprised in the works and the undertaker shall not be required to prepare more than one such schedule for the protected property.