Posh potato chips producer Tyrrells is offering consumers the chance to win a shiny new set of wheels in its first-ever on-pack competition. But it's not a car or a motorbike it's giving away, it's a Massey Ferguson 5455 tractor. If a tractor doesn't suit, a £25,000 cash prize is offered as an alternative. The promotion, kicking off this month, is also offering other farm-friendly prizes such as a pair of wellies.