Britain and Qatar have announced a £1 billion (US$1.3 billion) investment in green energy, British Prime Minister Keir Starmer told parliament on Wednesday.

Qatar will invest the money in climate technology in the United Kingdom, with engineering company Rolls-Royce set to benefit from some of the cash to support its energy transition.

The announcement was made during a two-day state visit to Britain by Qatar's emir, Sheikh Tamim bin Hamad Al Thani, who met with Starmer on Wednesday.

Britain is seeking deeper ties with the wealthy Gulf state, and Starmer hopes to use the visit to secure "tangible benefits" for the country on security and the economy, his spokesperson said.