Each month, millions of Britons eagerly check Premium Bonds results in the faint hope they may have scooped a big prize. Our number crunching shows that in the past year, a quarter of the 24 millionaires made by NS&I were from bonds bought in 2022. The way Premium Bonds work means bonds are only eligible a full month after purchase. The winner from Bedfordshire had £7,500 in Premium Bonds, and the Surrey winner £10,100. Taking the silver medal are eight savers who won 61 days after purchase.