Thanks boginspro. I know Brett Payne's website well and contributed a lot of the information on the Seaman studios. You can read my biography of the Seaman photographers here:
I think you're right. If it was Sheffield it would be recognised by now. I'll start looking at the other towns where he did a lot of stereo photography. He went to the Photographic Convention every year from about 1888-1907 and took photographs in whichever town it was held. Thanks!