What does the l or L refer to on each address? Is it a value of the property or business as in L,S,D,
or pounds, shillings & pence?

It's impossible not to notice there are 5 comb manufacturers between numbers 48 and 55 of this street, which is Pill Lane. I'd be curious to know when was the last year a comb manufacturer existed as a business, given that it was such a thriving business, 5 existed on the one street.