Prize bonds are a genuine alternative to deposits. The more so the greater the investment because of the law of large numbers. Ignore the big prizes, as I do*. The tax free return in €75 prizes is 0.79%. This beats our high street banks.
The inflation comparison is of course relevant but quite irrelevant in terms of choosing where to invest your deposits.
* Though it does sort of satisfy any lotto fantasy that I might have. Every Friday I have as much chance of a big win as with the Lotto and the "thrill" of looking up the result. That is simply icing on the cake.