I noticed on the 1851 census when Jabez was in Brigg that there was a lodger with the same name as one of my ancestors - Thomas Hobson - so I did a search on Ancestry to find Jabez Blessed in 1851 in Brigg, but having a senior moment

I searched 1861 instead. Guess what there was a Jabez Blessed birth year 1831, who was born in London City, living in Clerkenwell, Middlesex and who was a Bookbinder. By the side of the census results Ancestry now gives other instances of the same name, so clicking on a baptism, it showed that Jabez Blessed (born 1831) had parents called George and Ann. George being the eldest son of Barnabus Blessed, and the brother of the Jabez who went to Brigg.
There's also a George Blessed born 1829 (in Dorset) but back in London in 1861 who was also a bookbinder. There's also another Blessed, looks like Barnalia, born in Hampshire (wife born in Dorset) who was in London and he was a shoemaker - which was the trade Jabez' brother who was in the workhouse with him was apprenticed to.
It seems there were lots of Blesseds around London, working as Bookbinders, or shoemakers.