I can only quote what he has told me. Seems like he has been very lucky. All i am saying is that there isnt much of a risk chucking 10K into the premium bonds for a year to see what comes up. Maybe nothing but worth a punt if nowt else to do with the money.
Go for it.
It is by no means a good use of 10k, but you're right that there's no real risk in doing so.
But maybe this will convince you....
Put 10k into an ISA at 3% (easy to find) and you will have £10300 at the end of the year.
Put 10k into Premium Bonds and you can expect to have £10100 at the end of the year.
Source
On average you will be £200 worse off, unless you get lucky. Now clearly you're interested in Premium Bonds because you want a chance to 'win' something.
Well the chance of you winning 1 million pounds, from your 10k Premium Bonds is 1 in 100,000 (or 0.001%). [Same source as above]. And you're thinking, well I've got to be in it to win it, right?
Well now consider if you put your money into an ISA, you'd have been £200 better off. You could now take this £200 and buy some lotto tickets. Here your chances of winning the jackpot, with a single ticket are 1 in 14 million. With £200 of tickets your chances of winning the jackpot are 1 in 70,000 (or 0.0014%).
You now still have £10,100 but you have a BETTER chance of winning MORE money, than with Premium Bonds.
That's not even considering the added benefit of tax free savings you get with your 10k in an ISA and also that on average your lotto returns will be slightly higher than calculated, because I did it for the jackpot only, whereas with Premium Bonds the calculation is for all prizes over the year.
It's your money, but there are far, far better options than Premium Bonds.