76A. Neither section 75 nor section 76 shall apply for a maritime usage in a part of the maritime area consisting of development (including the laying of cables or pipelines or both) authorised by—

(a) a lease made under section 2 of the Act of 1933 pursuant to an application for such lease made under that Act before the establishment day, or

(b) a licence granted under section 3 of the Act of 1933 pursuant to an application for such licence made under that Act before the establishment day.