Iran has broken its agreed commitments to the Joint Comprehensive Plan of Action (JCPoA) over their nuclear activity.
A Foreign and Commonwealth Office spokesperson said:
"Iran has broken the terms of the JCPoA, following its announcement that it will start uranium enrichment above the 3.67% limit agreed in the nuclear deal.
"While the UK remains fully committed to the deal, Iran must immediately stop and reverse all activities inconsistent with its obligations.
"We are coordinating with other JCPoA participants regarding the next steps under the terms of the deal, including a Joint Commission."