Hi garlicsmutty - thanks for your advice - it was really helpful and I've started reading those links. I will note everything down.
The situation is complicated slightly by the fact that the boss (psychopath) is the big boss's protege. He thinks she's "efficient". She's quite young considering the position she's in, and has a questionable career pedigree, and I think the root of the problem is that she is insecure.
She's extremely unpopular throughout the company. However, she gets away with it, and survives because she is "the protege".
Secondly, the bullying deputy is the big boss's wife
. She's not a psycho, at least, but dislikes me, it seems, for whatever reason I know not! And rarely misses an opportunity to treat me with contempt.
She started to criticise me the other day but stopped short when she saw someone sitting next to me who we are both friendly with. Didn't want to reveal her true colours in polite company.....
If I were to pursue this along official avenues by making a formal complaint, it is possible that I might get support - and even a payoff - but because of the relationship of these two women to the big boss, I would never be able to work for that company again. And I have a lot of friends there - it would be sad.
Once again OP. I am so sorry for this thread hijack. I'll leave it and I hope that things start to look up for you soon.
I hope you feel you can "fight back" a bit - you sound a very nice person and unfortunately nice people get taken advantage of in this brutal world.
A good thing that works for me on a social rather than professional level is simply to give the offending parties the cold shoulder: disengage from them; turn your back on them. Your silence and absence will say more than a thousand words ever can.
Best wishes x