WASHINGTON - MARCH 10: Bill Gates, co-founder and co-chair of the Bill & Melinda Gates Foundation, prepares to testify before the Senate Foreign Relations Committee on Capitol Hill March 10, 2010 in Washington, DC. Both Gates and former U.S. President Bill Clinton voiced their support for legislation that will increase funding for global health and outlined what they believe could be cost-effective ways to fight HIV/AIDS and poverty around the world. (Photo by Chip Somodevilla/Getty Images)

Bill Gates, the software billionaire, has said he will invest in a British dementia fund set up to accelerate the search for a cure.

The Dementia Discovery Fund (DDF) was launched by the Government and British charities and pharmaceutical firms in 2015.

The Microsoft founder, 62, said he was looking to invest another $50 million in start up dementia companies. He said, “We are at a turning point in Alzheimer’s research and development, in which the DDF is playing an important role.”