British and Indian companies will sign collaborations worth more than 9 billion pounds ($13.7 billion) during Prime Minister Narendra Modi's visit to London, his British counterpart said on Thursday.

Speaking at a news conference, Prime Minister David Cameron said London wanted to support Modi in his vision to transform India with improved infrastructure and education.

"We want to become your number one partner for supporting the finance needed for (Modi's) ambitious plan, making London the world's centre for offshore rupee trading," he said, adding: "we're getting that started with plans already in place today to issue over 1 billion pounds in bonds right here in London".

"During this visit British and Indian companies are announcing new collaborations together worth more than 9 billion pounds," Cameron said.

India and Britain also signed a civil nuclear cooperation agreement after the two sides held delegation level talks here on Thursday.

"The conclusion of the civil nuclear agreement is a symbol of our mutual trust and our resolve to combat climate change," Modi said while issuing a joint statement along with British Premier David Cameron.

"The agreement for cooperation in India's Global Centre for Clean Energy Partnerships will strengthen safety and security in the global nuclear industry," he said.