The NASC is recognised as the national trade body for access and scaffolding in the UK.

ASITO is made up of representatives of the NASC, the Construction Industry Training Board (CITB), the Construction Industry Scaffolders Record Scheme (CISRS), employee representatives from TGWU and UCATT and the Construction Industry Joint Council (CIJC).

The SIA was formed in 1972 initially to protect and promote the interests of dealers and distributors of access and scaffold equipment.