The Explosives Regulations 2014 (ER2014) came into force on 1st October 2014. They replace many old explosive specific Regulations (including MSER and COER) and although the layout of the Regulations has changed significantly, the general content of them remain the same.
Two overarching guides have been published .
The text of the Explosive Regulations can be found here
In addition to the Regulations themselves there are 2 “Overarching” guides published by HSE