I have always liked the Derelict London website:
because it shows the City as it really is.
The changing urban landscape.
– places which I used to know that have fallen in to
disrepair.
– places which I’ll never see the insides of again.
&
– buildings which are about to be pulled down.
Just take a look for yourself.
http://www.derelictlondon.com/derelict_london_com.htm
Now there is a Derelict London book.