Walkers has launched a new promotion to highlight the success of its Monster Munch relaunch. It will be running a retro T-shirts promotion across its Mega Monster Munch range, enabling customers to get their hands on Monster Munch character T-shirts.

Consumers need to collect three bags of the crisps and send the empty packs in, along with a cheque for £5.

Since its September 2008 relaunch, the corn snacks brand has grown by 25% to £36m.

Kirk Tanner, Walkers VP impulse sales, said: "Monster Munch has always been a favourite in impulse and the relaunch has been an amazing success. We’ve seen significant growth particularly on Monster Munch Roast Beef and the 40g is now the second-biggest seller in impulse."