Thank you for your reply jorose.
I've got the record of Alexander Schloss's naturalization.
I know a fair bit about him, except where he was on the 1891 & 1901 censuses.
AMBLY has looked for him & couldn't find him, but did find me census info on his wife before their marriage, which took place in Birmingham.
The problem is with another branch of this family.
Michael Cohen (he's no problem) is on the 1871 census, born Poland, wife Elizabeth born Germany.
On the the 1881 census, she is called Betsy. On her death certificate she is Betsy, & I've been told that is what she was known as.
However, on one of the children's birth certificates, her name is Bertha, maiden name Smirsch. I bought another birth cert. Same name, Bertha Smirsch.
Someone got in contact via GenesReunited, saying he was descended from Bertha's sister, but the surname he had for the sisters was Jacobsen from Denmark. I told him I had a different surname for them, he said he would look into it, & I haven't heard from him since! But he does appear to be a relative as he has been to family gatherings in Nottingham.
What with the variations in her name, & Cohen being nearly as common as Smith, I don't think I've got much hope of finding a marriage or anything else.
But you never know, one day somebody new to family history may be searching the net & find this post & have just the info I'm looking for

Betty