Hi Tony,
This may be of no use, however looking at the map of this area in 1885 it shows Fish House Mill (Stoke Pound) as a Corn Mill. It may have been something different earlier in the 1800's or there may have been workshops or similar on the same site (nail or needle manufacture). The 1841 census won't be that much help either as it's the census with the least amount of information - just basic stuff. The other option is to go to Bromsgrove Library and search their Newspaper articles although I'm not too sure if they go back that far. Another could be looking at the trade directories, but again, due to the date you're looking at, they may not help. The only other option would be to look through the Parish records......
Thought I'd try and help as you had recieved no reply.
Regards,
Leigh