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Dr Roger Barker, policy director at the Institute of Directors, said it is "appropriate for the government to rebalance its approach with a pro-business orientation at its core" as "compliance with burdensome regulation is frequently cited by IoD members as one of the top factors having a negative effect on their businesses."

The IOD - often called the "Indian Niño" because of its similarity to its Pacific equivalent - refers to the difference in sea-surface temperatures in opposite parts of the Indian Ocean.

One of the strongest positive IOD patterns on record coincided with one of the strongest El Niño patterns in 1997 and 1998, with severe flooding reported.

However, when both a positive IOD and an El Niño occur at the same time, as was the case last year, the rains in East Africa can become extreme.

The scientists also said IOD had contributed almost equally to the intensity.