The UK is laying legislation to tackle Iranian nuclear activity and other hostile activities. The lack of transparency around Iran’s nuclear programme poses a serious threat to international peace and security. Iran has expanded its nuclear programme in ways that lack any credible civilian justification, including accumulating over 400kg of uranium enriched to 60%, making it the only country without nuclear weapons to enrich uranium to this level. The UK complied with its UN obligations to implement the snapback of UN Iran sanctions on 1 October 2025 and designated 71 individuals and entities in sectors linked to Iran’s nuclear programme. The Government will introduce legislation to impose further sectoral measures on Iran, including financial measures to reduce Iran’s ability to access the UK financial system, expanded trade prohibitions, and prohibitions on Iranian aircraft from landing in the UK. The legislation includes sanctions mitigations, such as general licences for the Shah Deniz gas field, aligning with EU and US policies. The aim is to ensure Iran is never able to acquire a nuclear weapon and to strengthen sanctions that reduce Iranian hostile capabilities.