The EU has implemented Commission Regulation 2026/1120 adding 12 additional unacceptable co-formulants to Annex III of Regulation (EC) No 1107/2009. This applies directly in Northern Ireland (NI).

HSE has considered the justification for each substance and has determined that they should be included on the GB register of unacceptable co‑formulants. On 5 November 2026, the GB register of unacceptable co-formulants was updated to include these substances. 

GB and NI PPPs or adjuvants with these unacceptable co‑formulants must be withdrawn or amended as soon as possible and, in any case, no later than 16 June 2028.

There are no grace periods for adjuvants once they are removed from the Official List of Adjuvants. The maximum grace periods for PPPs will be: 

• sale and supply will expire no later than 3 months after amendment or withdrawal of authorisation

• disposal, storage and use no later than 12 months after the date of amendment or withdrawal of authorisation
  
  

It is the product authorisation holder’s responsibility to review PPP formulations to ensure compliance. Where HSE has already identified affected PPPs or adjuvants, HSE will contact the relevant authorisation holders.

HSE advises submitting any applications for amendments ahead of the implementation date, to ensure HSE has enough time to process your application in advance of 16 June 2028. 

The UK government has agreed with the EU to work to establish a common Sanitary and Phytosanitary Agreement (SPS). This includes the pesticides regime. Negotiations are ongoing and final implications of the SPS Agreement are subject to change. However, HSE does not expect the negotiation to impact the required compliance with the updated register.