NS&I said it had paid more than 99% of the prize-winners since starting its popular draws in 1957, the BBC reported. Jessica Willock, personal finance expert at Confused.com, said: "Premium bonds are a popular way to save, but it can be easy to forget about them once they’re set up.

Premium Bonds holders are being urged to verify their particulars as nearly a dozen £100,000 jackpots remain uncollected. National Savings and Investments (NSandI) has revealed that more than 2.5 million Premium Bond prizes worth over £103 million are still waiting to be claimed.

National Savings and Investments (NSandI) has issued a warning that unclaimed Premium Bonds prizes have exceeded £100million for the first time. Following the August draw, NSandI reports that winners are yet to claim £105,022,575 across 2,615,187 prizes.

More than £100m of premium bond prizes remain unclaimed amid criticism that the government-owned bank which operates the savings scheme is not doing enough to find the winners. Among the 2.5 million unclaimed prizes are 11 winners of £100,

There are millions of prizes that haven't yet been claimed. We speak to experts to find out how to collect winnings and if premium bonds are even worth it

More than £100 million in premium bonds is still up for grabs, with two lucky people becoming instant millionaires every month. Premium bonds are a lottery-style government-backed savings account, with people able to add in or take out money whenever they want.