P11CAT just a thought. Did you register the marriage in the UK with Somerset house? I am Englsih and married to a Dominican but I have never bothered registering the marriage in the UK. Therefore under UK law there is no record of the marriage, hence I think I could remarry in the UK without divorcing in the DR - (not that I would tee hee).
Might be worth checking anyway with a UK lawyer. Obviously you couldn't remarry another Dominican but then I doubt you would want to.
Matilda