Bank interest might be low, but at least it is higher that the zero percent you get on Premium Bonds.

My mother has had a small amount of premium bonds for 40 years. In that time she has never won a single prize

According to their site if you won the average number of times it would equate to 2.15% (tax free). There are cash ISAs and online savings accounts that pay more than that.
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Remind me to change my signature to something more interesting someday