12.—(1) The power conferred by article 8 above shall be exercisable as well in relation to the subsoil or under-surface only as in relation to the land as a whole.
(2) Section 8(1) of the 1965 Act (limitation on right to require a person to sell part only of any house, building, manufactory or park or garden belonging to a house) shall not apply where the power conferred by article 8 above is exercised in relation to the subsoil or under-surface of land only.
(3) Union Railways may enter upon, take and use for the purposes of the authorised works so much of the subsoil of any highway within the Order limits as shall be required for the purpose of the construction or maintenance of those works, without being required to acquire that subsoil or any interest therein.