TDS’s include large marquees, stages, barriers, screens, lighting gantries, seating platforms, sound towers, art installations, inflatables.
TDS contractors/designers hired to design, supply, build, manage and take down a structure for you, should be competent and adequately resourced. Your TDS contractor should ensure that the proposed structure has been designed to take account of the use and conditions in which it is to be installed. The structure should be checked to make sure that it has been built according to the design.
A safety certificate should be obtained from the contractors as a record that all TDSs have been checked.
For a full and comprehensive guide: Health and Safety Executive