Of course it's not as simple as that, but with investments you can beat inflation whereas all savings account currently pay less than inflation.
With investments you MIGHT beat inflation, or you MIGHT lose a considerable amount of money. I suspect that as he's asking OcUK what to do with his savings risky investments are probably not his forte and a savings account is likely the best bet.

I have invested a relatively small amount of my assets I can afford to lose.
. I have simply stated some principles which should stand as a benchmark. Anyone who has done a decent finance module with a good grasp of economics should know what I said.