Strictly speaking, yes. If, for example, you are employed as a Bus Driver your employers are perfectly within their rights to engage you as a Cleaner. That may result in Trade Union activity, of course, and I doubt whether any reasonable employer would actually resort to such practice, but there is nothing in law which prevents them doing so.
It may well be the case that the job from which you were originally "removed" is one that your employers feel is uneconomic in that it does not generate the maximum profit for the company, and your employers are not legally obliged to tell you their reasons why the position is not being filled.