Rolls Royce were allowed to use as a redundancy criteria the longest serving!
The managers at Rolls Royce, scored each worker under threat of redundancy against five categories – achievement, self-motivation, expertise, versatility and personal contribution. The scores would then be used to select redundancies with lower scorers facing redundancy first. A final score of 1 point was added to those who had worked there the longest.
This factor if used alone may well lead to age discrimination shouts!