What are the premises of constructive dismissal. A guy has been working as a foreman for over 30 years. A new management team comes around and transfers him to a different section where he will be under the supervision of someone whose grade is lower

What are the premises of constructive dismissal. A guy has been working as a foreman for over 30 years. A new management team comes around and transfers him to a different section where he will be under the supervision of someone whose grade is lower than his previous position of foreman. Salary and benefits remain the same. Can this amount to constructive dismissal?