Hi Marina,
Took a long time over this.
Couldn't find any of then in 1861 or 1871. Found Thomas jnr in 1881 as you had found but this sheds no light.
Looking at the full page in 1851, the "ss" in the mothers place of birth Essex is the same as the"ss" in the daughters name.
To me it really looks like Laussed, but I can find no other reference to a name such as this.
Cheers, Colin