It's hard work. You need to find your particular book readers, so it's no good posting about your blog in a forum dedicated to money for instance, or in general forums.
First you need to find if there are any other book blogs out there. Try Googling "book blogs" or "British book blogs" or "Uk book blogs" or some such variation (and use other search engines like Yahoo, Lycos etc too as they may give different results). Don't just look at the first page of results - really trawl through the first fifteen pages of search results to see if you can find other book blogs (I know it's time consuming but it's worth doing). Try searching for reading groups and book clubs too.
Then make contact with these blogs through their comments section. Make a friendly comment, ask if you can exchange links with them (to build your Google page rank). Make sure you read these blogs frequently as they will probably have tips about how to make contact with other book blogs and how to get readership.
Try to find online chat forums where they discuss books, and post there, putting your blog URL in the signature. That should bring you traffic too.
In order to build Google page rank you need links - preferably from other blogs, but links in signature postings at forums count too. Once you have worked to build your Google page rank (which will take three months, as Google put newbies into the "sandbox" at first), you will start to get hits from people doing Google searches, especially if your page rank is a 4 or above. That's the real McCoy - people actively searching for the subject you are writing about and clicking through to you. But it only happens if you are on the front page, so work at developing those links, and work at producuing good content on your blog.
Goog luck!
 | 
Linear Mode
