such notice the Director may effect the necessary repairs
and alterations.
(4)
If at any time there exist, in the opinion of the
Director, any circumstances requiring the immediate putting
into effect of such repairs or alterations he may require
the Road Company to effect the same forthwith or, if he
thinks fit, may forthwith effect the same with or without
notice to the Road Company.
(5) Subject to subsection (6), the expense of repairs
or alterations under this section shall be borne by the Road
Company and where any such repairs or alterations are
effected by the Director the expense thereof shall be
recoverable from the Road Company by the Government as a
debt owing by the Road Company to the Government.
(6) Where in pursuance of the obligation imposed on it
by subsection (1)(a), the Road Company carries out any works
of repair on the fabric of the immersed tube after the
revocation or expiration of the franchise granted to the
Rail Company by section 5(1), the Government shall be liable
to pay to the Road Company one third of the costs reasonably
incurred by the Road Company on those works.