I've lived in Lincoln for the last 15 years and been punting for the last 7 or 8, i've never heard of a Red light District and i've never seen street walkers! In fact the only town i've ever seen street walkers is Grimsby!! proper crack head scrawny looking fuckers!
I can't think of any one street that has more than a couple of houses that girls work from, the Monks road area has a few girls working around it, but there is a lot of roads off Monks Road with a lot of houses on them that you couldn't call it a red light district.