6U.K.The following provisions of the Port of London Act 1968 (c. xxxii) shall not apply in relation to anything done for the purposes of or in connection with the exercise of any of the powers conferred by this Act with respect to works—
(a)section 70 (prohibition of various activities in relation to works without a licence under section 66 of that Act), and
(b)section 73(3) (prohibition of dredging etc. of Thames without a licence).