I've done this too, just a case of pushing it and pushing it gradually. Making an arse of youself and forming enemies. One trick is to pick battles with thick people with no actual power in the company, all the mutton-dressed-as-lamb, menopausal battle axes just loved me. Over time you'll get pulled into the office for a chat, disciplinaries etc. There fight your case passionately, deny all charges, blame everyone else and make like you're the victom.

Inevitably you'll get set up for a fall, if you've choosen wisely it'll be a piss poor effort then after that inform someone else with a bit of know, HR etc, that you've been keeping a diary and any attempt to suspend/sack you etc will result in you going to a tribunal for victimisation and unfair dismissal.

By the time I left, I had them right over a barrel, coming in 45 mins late, doing a total of 2 hours max work a day and just sitting on the web and moaning all day long. But they couldn't do ought as they knew I had enough of a case on them and sharp enough to word that case quite eloquently.

Ultimately it's a soul destroying experience though, stressful and even your mates at work who you do lunchtimes/go drinking with or that start to get hacked off at you. At the same time every other middle manager, line manager etc hates your guts. In the end took me a total of 2 years and like dub it was during some restructuring I finally got the push for just under 1/2 a years salary.

Was nice to have a bit of a lump sum but in hindsight I dunno if I'd do it again, knowing how long it actually took to drag out.