Nelson Mandela's grand-daughter, Zaziwe Dlamini-Manaway, has said she is "overwhelmed" to be celebrating his 95th birthday with him. Speaking to Africa Correspondent Rohit Kachroo she said:
"I am just so happy that today is my grand-father's birthday and he is here and we are able to share this day with him."
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Mr Blavatnik, whose empire includes the Warner Music Group, has an estimated fortune of £13.17bn according to the Sunday Times Rich List.
Find out what to expect from the weather if you are running in the big race in London or watching from the sidelines.
It will be a soggy start to the weekend and temperatures will drop making it feel colder than in recent days.