Can anyone explain the employees rights in the following situation?

A promotional/upgrading policy exists which operates on an annual basis with applications (with the support of line managers) being submitted by employees. If a department is under review (in terms of it’s remit, structure and place within the hierarchy of the organiation) is it acceptable to place on hold the applications of that deaprtments staff?

If there is evidence that employees in different departments have received notification of their upgrading (or not)while that department is under review, does this constitute discrimination?

If other employees in the same department, but on a different pay scale/terms and conditions were awarded a promotion/upgrading while a review was underway does this constitute discrimination?

Thanks
nikki musgrave