Thanks, that's interesting. I wonder what Irby Hall was? Sounds a bit larger than a cottage, which was what I was envisaging. I am only making the assumption that it was close to Irby Road, as I have no proof.
My 22year old greatx3 grandmother was the wife of a sailor - I can't find her or her husband on the 1841 Census - but I know she was in Boston for the birth of my great great aunt in June 1840.
I think by Census time in 1841 they were on their way to London - probably by sea - and my great great grandfather was born on the way and registered at landfall, or so family legend has it.
So they had departed Boston for the big smoke by the time that the railway opened in 1848.