I was talking to my boss about this today and he was telling me about some of the applications he's had for a job he's advertised. He's had people who were in managerial positions apply for what is a skilled/manual job and who have begged to be considered as they've been out of work for months.
Basically, it's hard out there. It's not the time to be looking for the best money and conditions you can force out of your employer, it's a time to knuckle down and be thankful you have a job at all.
I disagree with a lot of the changes foisted on the Royal mail staff over the last decade but it can't stay as it was. Things have changed, the world is more competitive, and those in work have to work harder and smarter than they used to. If the Post Office doesn't do that then someone else will do it for them.
I also agree in principal with the idea of unions. Unfortunately it would seem that too often they are too blinkered, selfish and short-sighted to work properly. Seems to me that the stronger a union is the more likely they are to bring about the demise of the business who's workers they represent.