The Atex Directives are primarily implemented, across all industrial sites, by 2 regulations into British Law and andd these remain (until otherwise changed) irrespective of Brexit.
The Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres Regulations 19961 EPS implemented the requirements of EU Directive 94/9/EC (Later 2014/34/EU)
It requires the "responsible person"(usually a manufacturer or their authorised representative) who places equipment on the market or puts equipment into service, has ensured that the essential health and safety requirements for the equipment have been satisfied. This includes carrying out the relevant conformity assessment procedure and application of the CE mark.
Directive 99/92/EC on minimum requirements for improving the safety and health protection of workers potentially at risk from explosive atmospheres2 was implemented by:
Dangerous Substances and Explosive Atmospheres Regulations UK 20023 (DSEAR)
Which requires the following to be carried out and documented: