However, what if your mother had put the actual £15 in a drawer?
That would have been the *worst* situation for that sum of money in terms of outcomes, as at least you've had the chance to win something in the meantime with the Premium Bonds, even if that didn't actually happen in this particular case....
LOL. Very funny.
In terms of outcome, I could easily argue that the outcome is identical. £15 = £15.
But then I checked on eBay. If my mother had put 3 x mint condition old style £5 notes which were in circulation at the time in the drawer and I sold them on eBay now then I’d receive around £30. So money in the drawer would have been better than the Premium Bonds.