LONDON, June 19-- Chinese Premier Li Keqiang left here for Greece on Thursday, wrapping up a fruitful visit to Britain which witnessed the signing of a series of cooperation deals worth 30 billion U.S. dollars.

During his four-day trip, Li held in-depth talks with British leaders including Queen Elizabeth II and Prime Minister David Cameron, exchanging views on advancing bilateral ties and practical cooperation.

When meeting with Cameron on Tuesday, Li proposed that China and Britain expand two-way trade to reach a target of 100 billion U.S. dollars in 2015.

He also urged the two countries to advance cooperation in such areas as finance, high-speed rail, scientific innovation, green economy and aviation.

Li witnessed the signing of a series of cooperation documents, and a China-Britain joint statement was issued during his stay in London.

This year marks the 10th anniversary of the establishment of the China-Britain comprehensive strategic relationship. The two countries pledged to seize the opportunity to lift bilateral relations to a new level.

The Chinese premier also attended a Britain-China Financial Forum, co-chaired a global economic roundtable with Cameron and addressed a gathering hosted by two prestigious British think tanks, among others.

Addressing the global economic roundtable on Tuesday, Li urged the international community to strive for inclusive development so as to achieve healthy growth of the world economy.

At the gathering, co-hosted by Chatham House and the International Institute for Strategic Studies, the Chinese premier touched upon topics including China's development and its foreign policy.

China, with a population of 1.3 billion, will foster the largest inclusive development in human history by achieving modernization step by step, he said.

It was Li's first trip to Britain as premier, and another major diplomatic event between China and Europe following President Xi Jinping's visit to the continent in late March.