I've only just seen this and did some checking.
In 1851 census, Louisa is in Leighton Buzzard. Joseph is a brickmaker in Middlesex. He came from Leighton Buzzard.
I'd assume they both ended up in Great Gonerby in connection with the building of the Peascliffe Tunnel, which needed bricks. theer were huge numbers of brickmakers in Gonerby in 1851.