Premium Bonds have been scrutinised as the lottery-style savings option means more wealthy Britons who can afford to leave larger amounts deposited stand a better chance of winning.

Provider NS&I is often contacted by frustrated customers who have won nothing in decades. But the reality is it’s not the length of time that is the key factor in boosting your chance of taking home a prize, but how many Bonds you hold.

Analysis from Martin Lewis’ MoneySavingExpert shows you need at least £10,000…