r. 5.1.4
In this Part "structure" includes—
(a) any construction wall, mast, tower, pylon, or structural cable; and
(b) any tunnel, shaft, underground tank, pipe or pipeline, sea defence works, river works, earthworks, earth retaining construction, or construction designed to preserve or alter any natural feature; and
(c) any road, railway line or siding, tramway line, airfield, dock, harbour, inland navigation channel, bridge, viaduct, waterworks, reservoir, aqueduct, constructed lagoon, dam, sewer, sewerage or drainage works, electricity generation facility, electricity transmission facility, electricity distribution facility, gas generation facility, gasholder, gas transmission facility, gas distribution facility, or park or recreation ground facility; and
(d) any ship or submarine; and
(e) any fixed plant; and
(f) any formwork, falsework, scaffold or other construction designed or used to provide support or access or containment during construction; and
(g) any part of a thing set out in paragraphs (a) to (f).