The difficulty for the tenants living in them is that these homes have energy efficiency ratings well below the average for the UK as a whole. This makes them expensive to heat, and whereas the landlord might want to improve them to make them more affordable for the tenants, options to do this are very restricted because they are within the conservation area.
I found myself wondering, what's more important - preserving the street-scene by keeping the traditional look of the homes in the street, or preserving the lives of the elderly residents? Make no mistake of it, old people do die because they have to make difficult decisions between eating and heating their homes.
If this article makes you think about the rights and wrongs of this, you might like to check out this report on the affects of Fuel Poverty (which is what it's called) . It's available here.