1 is on Lombard Street East, on the left as you walk toward the river. 4 is of course the Bolands Mill. I'd know that yellow lettering in my sleep.
Some of the fjp photos ctesiphon mentioned can be found <A HREF="http://www.fantasyjackpalance.com/fjp/photos/city/index15a.html">here</A>. I miss fjp.
There are many fine examples of hand lettering there, many of them faded and quite beautifully dilapidated. I think there is even a Finn's Hotel in there, Graham.
It's easy, once you start looking, to get obsessed with finding these throughout the city. About a year ago in NYC I saw typography guru Tobias Frere-Jones speak eloquently about these ghost signs, 'examples of lettering that are no longer with us.' In a feat of documentation that absolutely boggles the mind, Frere-Jones has embarked on the Quixotic quest of collecting every single example of typography and lettering on public buildings in New York City. Last I heard, he'd made it from the south tip of Manhattan all the way up to 14th Street. Over 4,000 photographs.
I have a pithy collection of my own on a memory card somewhere. Will have to dig them up.