When a number of staff are being selected for redundancy, your employer must ensure that the basis for selection is fair and does not unfairly discriminate against you. If they don't, you could take an unfair dismissal case to an employment tribunal.
Redundancies cannot therefore be chosen on grounds of gender; race; age; disability; sexuality or religious belief either directly or indirectly.
Often employers ask for volunteers and offer early retirement before considering compulsory redundancy.
The criteria that can be used by an employer include:
You should be told what factors have been used in the selection process. If not you should ask, and if you are still not told you should seek further advice.
If you are in a union, it may have agreed a redundancy procedure with your employer, so check with them that this has been followed.