// A third man has reportedly stepped forward to claim a £4million lottery prize, arguing that he deserves the money because his card was used to buy the winning ticket. //
No, he didn't buy it. The robbers did, but using the details from someone else's debit card. The card details were written down on his arm. It looks like the details were stolen, rather than the actual card.
if it's a debit card, you can buy (say online) using the numbers off the card without having to be there. I don't know how it would work in a shop without the card to swipe. someone else will have to answer that one.