Walkers is claiming its Rainy Days promotion achieved an "unprecedented level of consumer engagement" for the brand.

The three-month campaign, which started in September, offered £10 to consumers who correctly predicted rainfall in the UK or Ireland. The PepsiCo company paid out £1.4m in cash prizes. With 2.8 million website hits and 450,000 accounts registered, it described it as an "incredible competition."

The Met Office said rainfall was below average during the promotion.