ahem... did you mean the change to the Lanes or the to the Laine? the old town was never the "Laines" and was always housing (well, few hundred years). the North Laine was built up in the regency period, along with much else.
No, I meant the laines (lower case L) in referring to the North Laine, West Laine, Little Laine, Hilly Laine and East Laine we were talking about earlier.