Thank you very much, Justin. I didn't know about the large "Kempen" in Poland. That far east would be a much more likely location, I think. I was surprised when I thought it might be the Kempen near Krefeld.
Yes, it's certainly a needle in a haystack, but I'm willing to try. (anticipating not getting anywhere) It would be no problem to get someone (or people) to help me with the German, Polish, & Yiddish.
I've got the nineteenth century English census details, but how would I work back ? The family used what we would think of as Jewish names for the first generation in England, but, after that, they used English ones with the odd "Jewish" one thrown in (Jacob became James or maybe it didn't; maybe they just liked James & a name like Joseph is fairly neutral. There is an Isaac in the generation of the grandchildren, but it's very much a "one off". Names like that, & Abraham etc, were abandoned fairly quickly). But the first generation born in England did have Jewish names.
I realise I'm probably not going to be sucessful, but, if you can tell me HOW to go about things (if it's at all possible), I will try & take it from there. Thank you