This procedure is usual these days as employers need to be seen to doing the right things and not acting in haste. I am dealing with a similar case for someone which is scheduled to go to Tribunal in June - over a year since the redundancy selection and they had to go through sham interviews first.
Have written a letter for someone else in a dispute - she only works 5 half days and for family reasons needs to go down to 4. The employer is trying to get her to sign a new contract which ignores the 17 years she has worked there and states she does not get paid when sick. There are some thoroughly rotten people and dirty tricks being played on people who do not know their way around contracts and grievance procedures. Should hear on this one on April 6th.
Any hint of unfair selection for redundancy you should make sure you raise grievances under procedure set out in contract.