The point that Litebulbs makes is very important. An ET does not have the ability to enforce a re-engagement order. So the bottom line is that a lost job would not be regained.
It is a brave man or woman that is willing to risk a well paid job with good T&Cs at the moment. The economy is hardly buoyant and jobs are difficult to come by at the moment, with the knock on effects of the Irish economy and subsequent jitters over Portugal and Spain, this is not the time to be so stupid as to risk your employment over some esoteric point. Paying the mortgage should be more important than making some petty industrial point to your employer.