Not quite redundancy...
...but a cautionary tale surrounding fixed-term contracts.
It you have two employees approaching the end of such contracts and you only have funding to extend one contract, make sure you remember to complete the paperwork for the one you want to keep...
Early on in my career, I found myself in that situation - I had hit the top of my pay scale and the post would have to be re-graded to keep me on, the other person was one point off the top of the scale so they just could extend her contract for a year. Simple financial decision, bye Chris.
I found myself another gig and moved on, but about a month later $EX_EMPLOYER rings up asking for help. Seems that they had forgotten to do the paperwork for the other person, and she found another job during her notice period.
Apparently she had cleared her desk on her final day, and walked out as though nothing was wrong. They only realised what had happened when she phoned in the following Monday morning to say that she wouldn't be in work that day - or ever again - because she had a new job.
Did I mention that this was a three-person team before I departed, and (my now former) boss was on holiday at the time ?