Agriculture Minister David Heath said retailers and food distributors have assured him they are "on track to share meaningful test results by Friday" following the horsemeat scandal.
Mr Heath said he reiterated to them during today's meeting that the current situation is "totally unacceptable".
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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.