Müller is launching its biggest ever on-pack promotion for Müller Corner, ­giving away £1m worth of gifts to shoppers.

The nine-week campaign which kicks off this week is part of the brand's Thank You Cows campaign. Shoppers who enter a code from promotional packs into www.thankyou cows.com will have the chance to win chocolates, a cow-themed game, a spa day or cash of up to £1,000.

The giveaway will be supported by a £2m campaign, which includes a re-run of Müller's Thank You Cows TV ad.