I have been trying to quit for about 3yrs, but they keep turning me down for redundancy

(we should get enhanced package). I cannot afford to leave without the package, unless I walk into another similar job the next day. I have various server skills - Windows, Linux, Solaris, Netware, Exchange, SQL etc having done 12yrs of 3rd line with that lot, but jobs near me are not common.
I have to deal with idiots all day long, mostly those in grades above me. The latest is I cannot access our company intranet or email, because I do not have a company build on lappy (because I work 100% at a client site, on their network, supporting their servers). The company I work for will not allow me to use another email address I can access, so I can't find out whats happening with anything. I can't do my time recording, as its on the company intranet, so have to have weekly bollocking over that. Its a crap state of affairs.
Now, to top it all, I have to spend this evening writing
my APR, in my own time.
The NHS, with all its issues, isn't a bad place to work. The supposedly 'good' companies to work for, mine included, are far worse. And to add insult, we're all about to be TUPE'd for the 2nd time in 4yrs - bloody great for moral.
So yes, I wanted to tell them to shove it, but common sense must prevail.