The U.S., Britain, France, Russia, China and Germany proposed to Tehran in June 2006 cooperation in civilian nuclear technology, trade and other spheres in a bid to persuade Tehran to give up uranium enrichment and resume talks with the "Iran-6" group of negotiators.
"I am glad to say that we have got agreement on an offer that will be made to the government of Iran," Miliband said.
The Western nations suspect Iran of seeking to build nuclear weapons under the cover of a civilian nuclear program. Tehran insists in needs uranium enrichment technology to generate electricity.
The Islamic Republic has rejected the 2006 incentives. It has also defied three rounds of relatively mild UN Security Council sanctions imposed over its refusal to halt nuclear-related activities.
Miliband did not reveal details of the new offer, but said it symbolized a new approach to Iran.
He also said the five permanent UN Security Council members and Germany continued to insist that Tehran suspend uranium enrichment, the technology that posed a serious security threat to the region.
Miliband said the rights sought by Iran "need to be accompanied by a clear set of responsibilities and its in the spirit of seeking to fulfill both the rights and responsibilities that we are making a new approach to Iran on the basis of today's meeting."