What does being "listed" mean?
Does it mean that you can't knock it down or is it just on a list somewhere? Does it mean that these places are safe from development?....
Edited...Apologies, I found it...
Grade I - these buildings are considered to be of exceptional interest
Grade II* - these are particularly important buildings of more than special interest
Grade II - these are buildings of special interest, warranting every effort to preserve them.
Essentially, you need "listed planning consent" in order to knock it down.