These Regulations amend the Ammonium Nitrate Materials (High Nitrogen Content) Safety Regulations 2003 (S.I. 2003/1082). Regulation 2 amends transitional provisions relating to EU Exit, to permit detonation resistance testing of ammonium nitrate imported into Great Britain from countries outside of the European Union to be carried out at competent laboratories based within the UK or the European Union, and to correct minor errors.