Looks hand-done to me.

- Lex

Thanks Lex, you're right, I should have noticed the difference between letters. Do you have a sense of what type style(s) is informing it?

I just found an imitation font distributed by K-Type called 'Blue Plaque' but I would prefer it not simulate the engraving: http://www.k-type.com/?p=548

Here is an obituary to the designer of the blue plaque, Henry Hooper: http://www.independent.co.uk/news/obituaries/henry-hooper-529544.html

And in the spirit of answering my own query, more info on the design here: http://www.english-heritage.org.uk/server/show/nav.1496

That last link indicates that it is their own (custom) font. I guess you will have to find something similar.

- Mike Yanega

Goudy Sans has a similar spirit. The rougher version from P22 might suit your project:

LTC Goudy Sans
http://p22.com/lanston/goudysans.html

ITC Goudy Sans
http://new.myfonts.com/fonts/adobe/itc-goudy-sans/