The Secretary of State may construct the works specified in Part I of Schedule 1 to this Act (“the scheduled works”), being works for the construction of a new bridge over the Severn Estuary between England and Wales and roads leading to the new bridge and associated works.

Subject to Part II of that Schedule (supplementary provisions relating to the scheduled works, including provisions permitting deviation from the deposited plans and the deposited sections), the scheduled works shall be constructed in the lines or situations shown on those plans and in accordance with the levels shown on those sections.