I think I can guess which firm this is, and if I'm right there is quite alot of this going on right now. They are trying to manage headcount.Going to a lawyer won't look good to either party in the long run. I've heard people are being offer 6 months salary to hand in their notice, so ask for that. If they give it to you, then I suggest you register with a couple of recruitment consultants, go travelling for 3 months then come back and find a job. You cant tell future employers that you wanted a career break and thats why you left. Having had time away to think about things you've decided you now want a new challenge in your career etc.This way you don't look bad when talking to future employers, and leave because you resigned and not because you were forced out on a performance management process (which will never sound good on your reference). And you should get a chunk of cash too.Good luck!