practicing lawyer now but specialize in corporate commercial/succession, do a little of family but mainly on inheritance issues.

For your case, its doable. First I assume you have obtained a Consent Judgment and entered into Decree Nisi years ago to annul your marriage and divorced her, which custody of the children was given to the ex wife.

what you should be doing now is to vary the consent judgment, with valid justifications, and actually if she remarries, you need not to be paying maintenance anymore, you may drop me a line with the paper works for preliminary advises.