Matthew Ward (and some of the others) is a Tailor I - what is the I for? 
I believe these "I's" are probably J for Journeyman.
I think you've got it!
Carole
I originally thought they may be J's too, but I think a few pages over there is "J" which actually looks like a J with the tail going below the line .... so I'm still not sure.
Carole, I like your thinking aloud. You've made some really interesting discoveries.
The trouble with the possible Bagg/Vagg confusion is that the Catherine Vagg who appears to be wife of Richard Vagg in the 1841 census, appears as a widow on the 1851 census - surname
Vagg. And there is that death for a Richard Vagg in 1844.
But there are some interesting coincidences especially the signature of H Bryceson.