"On the9 January 1991 a notice was issued stating that persons would be considered for redundancy `according to the following criteria: the prime factor will be the overall interests of the company, with particular regard to ability, versatility and reliability of individual persons. Subject to the above, consideration will also be given to length of service and notification given by individuals to their supervisors of their wish to be made redundant. This notification must be given by 12 noon on Thursday,10 January 1991 .'"