Johnson met with the presidents of Nigeria, Rwanda, Ghana and Uganda at the summit, and was due to hold talks with the leaders of Egypt and Kenya on Tuesday.
The UK-Africa Investment Summit, being hosted by British Prime Minister, Boris Johnson, started yesterday and has brought together businesses, governments and global institutions to showcase and promote the breadth and quality of investment opportunities across Africa.
On his part, Buhari said Brexit offered an opportunity for increased free trade across the Commonwealth, adding that visas were a key issue.
The Prime Minister said he was committed to creating a "fairer" system once freedom of movement ends next year.
Speaking at the UK-Africa Investment Summit in London, Johnson cited his country's $53 million (Sh5.3 billion) investment at the Mombasa Port in 2013 as an example of "a relationship that benefits us all" and makes a lasting difference.
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A third person was confirmed to have died, and in Wuhan 136 new cases were found at the weekend, the local health commission said. Since then, Japan reported its first case of the infection on Thursday after a Japanese man returned from visiting Wuhan.
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Retail and healthcare workers are said to be most at risk because they are more likely to be in contact with lots of people. It takes up to two weeks after vaccination for the body to build immunity, so don't delay getting a flu shot .
Here’s who the New York Times’ editorial board endorsed for president
Pramila Jayapal (D-Wash.), who has also agreed to serve as the national health policy chair for the Vermont senator's campaign. Warren right now are the Democrats best equipped to lead that debate". 'May the best woman win, ' the Times concluded.
"Instead, we're going to focus on supporting the transition to lower and zero carbon alternatives".
"But if Britain wants to lead by example, it should also urgently phase out support for oil and gas developments, which are pushing the world closer to climate chaos".
The UK government says it has signed 11 trade agreements with African countries, just over a week before it officially leaves the European Union.
All in all, the announced commercial deals between United Kingdom companies and African partners announced at the Summit amounted to £6.5 billion ($A12.3 billion) and included agreements from big-name British firms such as Rolls Royce, GSK, and Diageo.
After securing Britain's departure from the EU-the world's largest trading bloc on January 31, 2020- Johnson is keen to develop business ties with countries outside Europe.