Qatar has begun talks with the UK government to invest up to £10 billion ($14.92 billion) into key infrastructure projects in Britain.
The news emerged as Britain's Prince Charles and his wife Camilla arrived in Qatar as part of their tour of the Middle East.
Officials and ministers from both countries held talks over what schemes Qatar could invest in and whether a specific fund could be set up, The Financial Times reported.
Although the £10 billion investment figure was cited, a timeline for the investment has not been agreed, the FT said.
Potential projects include power plants, road and rail projects and even the Thames 'super-sewer' project under London, the daily reported.
The new £14 billion nuclear reactor at Hinkley Point in Somerset planned by French utility EDF was one of the schemes discussed, the FT said.
Qatar has spent billions of dollars in the UK, with investments in the Harrods department store, the Shard skyscraper in London and BAA, the owner of Heathrow airport.
It was not clear whether Charles and Camilla are involved in any talks concerning further investment during their trip to Qatar.
The royal couple visited the Museum of Islamic Art for a private viewing and a meeting with Sheikha Mayassa, the emir's eldest daughter, before a reception at the museum for contributors to the Qatar-UK Year of Culture 2013.
In Jordan on Wednesday, Charles and Camilla visited a camp for Syrian refugees in the north of the country. They are also due to visit Saudi Arabia and Oman during their tour.