Hi Geoff,
Margaret in 1841 just has N after her name -which means she wasn't born in the county she was living in.
On the 1841 you just get Yes or No for p.ob.-unless it is another country - S for Scotland, I for Ireland
Carole and I both got our 1841 info from the same census -I put the Corkhill family in, as it looked as if they were living in the same premises and they may feature somewhere in future research-or the premises may have housed 2 dwellings.
Will have a look on later census to see where Alice stated she was born.
I have come across before where the p.o.b. given on a census is sometimes where they lived last or where they grew up.
Suz