Hi Turvey
I can only use my own tree to cross reference against the description given on the voter criteria link.
I'm typing this up how it makes sense to me but most likely won't read well or make sense to others but here goes :
Mine were mainly labourers in tenements too !
So, in my head, for it to make sense the rated occupier as Hallmark stated is what out folks would have fallen under as the extra criteria needed plus the obvious age one.
Then I feel that there was a rent book and it was the person named on the rent book only whom was the rated occupier and whom then could go on to vote.
So, this doesn't explain a lot of others (those I call head of households) from MY tree, whom are missing from the electoral roll.
So, I'm looking at the £4 criteria listed against the value of the rated occupier total house.
I am making a presumption here that like all things, that even amongst the poor folks, there was a hierarchy of tenement.
The lesser value tenements then didn't fall into this qualifying criteria.
Does that make sense ?

Again, I could be wrong, but using this explains MY tree but maybe not other people's ancestors.
Tara