Bushwacked – I've just been through a similar process in November.
The company I worked for had a shortfall in one side of the business and made a number of redundancies in the opposite side, the side I worked for.
We were the 'new' part of the business and a number of us went. I was the only one doing my role 'head of sales' yet they've kept the full sales team on who aren't being managed at the moment!
I travelled 4.5 hours for my first 20 minute meeting! I didn't attend my 2nd or 3rd meetings but did them over the phone, I asked why they'd want to spend £50 on petrol or £80 on train fares when they were trying to save money. Frankly I knew that they wanted to get rid of the newer guys who were trying to change the business, move it forward and were challenging the status quo.
I've been through the redundancy process a number of times, the one thing I will say is that all the forms and assesment processes are there to back up and justify the company's decision. For whatever reason they have targeted you, maybe because as you say someone has a grudge.
My advice would be to try and extract as much money out of them as possible and spin the whole thing out as long as possible, maximising your income and giving you a chance to apply for a new job.
There are jobs out there, the challenge seems to be finding one at the right level and with the right company, at the moment I'm still looking!
Good luck, try and enjoy Christmas, difficult I know, keep up the positive attitude