I signed a compromise agreement many years ago. I had to sign to say I'd had legal advice - but I hadn't. The firm of solicitors being paid to "advise" me were also the union solicitors & my rep was out of his depth. Someone instructed the solicitors not to talk to me - I was eventually informed of this by a sympathetic solicitor (in possession of the humanity that others lacked) who came on the phone briefly to explain what was going on. I signed as I'd been bullied in work & it led indirectly to a serious assault outside work (I did not, could not, tell anyone in work about it ). I signed because I was so traumatized & exhausted I just couldn't take any more. What I did not expect was to be blacklisted but that is what happened. Clearly they ignored the "gagging" clause & discredited me. The bully's lies unchallenged & unrebutted. I guess there's nothing I can do about this except to try to prevent it happening to someone else. I wish I'd gone to a totally independent firm for advice. It may have been futile - but it could not have been worse (notwithstanding fees obviously but they would not have been too great I imagine.)
Look & learn - from my mistake.