Moan On, my understanding of UL is that those who have opted to take leave and not be paid, will have priority over those who have left the company and taken the redundancy money. If a redundant person wants to rejoin the company, it will be after those who have stayed.
This is how UL was sold, the choice was down to the individual. This I gather is also in keeping with management's thoughts, and should be the subject of some interesting legal 'discussion' if challenged.