Junior Foreign Minister Alistair Burt travelled to Iran for talks with Tehran as European signatories to the nuclear deal try to keep it alive.
The deal relaxes economic sanctions on Iran in exchange of the country stopping its nuclear weapons development.
US President Donald Trump pulled out of the accord earlier this year, and slapped sanctions on the country.
State news agency IRNA quoted Iranian Foreign Minister Mohammad Javad Zarif as telling reporters: “It is time for the Europeans to act in addition to voicing their political commitment.
“These measures may be costly, but if countries want to reap benefits and if they believe the nuclear accord is an international achievement, they should be ready to keep these achievements.”
Mr Burt earlier met Iranian Deputy Foreign Minister Abbas Araghchi, Iran’s state television reported.
Mr Zarif said the talks with Burt had involved “access to banking resources and the sale of oil.”
Iran has been seeking commitment from European signatories of the nuclear deal that it will be able to access the Western banking system and continue to sell oil despite U.S. sanctions.