I have been searching for my ex husband, or any of his family, for months. not a sight nor sound of any of?

any of them, they live in england some where, (it was manchester ) they seem to have vanished, even extended family. iv tried every site i can think of 192.com, finding people uk, pple, land registrys, electoral rolls phone books adds in local papers and nothing, has any one any ideas, please, my kids are all grown up and have there familys and want to find their dad tanx