I've checked my Premium Bonds for wins this month, have won two £25-00, which brings my total winnings for the 7 months of this year to £425-00, that's on the maximum holding of £50K, giving about a 0.85% return.
With current 1 year fixed rate bond interest of about 2%, P/Bonds plainly dropping in being worth while.
There is of course the chance of a "big win" and also the money is sheltered from tax, but decisions to be made soon as to whether to keep my P/Bonds going.