Thanks for that, Barbara.....
Following the marriage certificate arrival today for Joseph BAUER and Emma MANSFIELD, I went back to the 1841 census to look for Emma again.
The only Emma Mansfield I can find born in Montgomeryshire is the following……
HO107/ 1440/ 14/ 17/ 25
Aberhafesp Berriew, Montgomery Wales
Joseph Mansfield 63  Farmer
Emma Mansfield 19  
Evan Brunt 37  
Martha Jones 17  
This Emma does have a father Joseph, but he is a farmer, not a Timber merchant. He was not born in the county, while all the others were.
There does not seem to be an appropriate Emma in the 1841 Census for England, and in 1851 Emma did say she was born Montgomery.
......dee