Biographies of British Prime Ministers?

I've been (inadvertently) starting a collection of biographies of 18th and 19th century British Prime Ministers and I've decided to make it an official search. So far I have bios for the following:

Lord North
Wellington
Palmerston
Disraeli
Gladstone

Can anyone recommend other? Preferable more recently released so as to be available at reasonable coast. Thanks for any help!

As you don't appear to be overwhelmed with suggestions, here's mine - just to keep the ball rolling.

Edward Pearce - The Great Man,Sir Robert Walpole: Scoundrel, Genius and Britain's First Prime Minister. Pimlico, 2008,pbk. isbn 9781844134052.

P.S. and how could I have forgotten William Pitt, the younger, by our own beloved Foreign Secretary, William Hague ?

I suppose Asquith, by Roy Jenkins is a bit out of your period?

Thanks for your suggestions, I'll give them a look!

Oddly enough I was looking in a remainder shop this afternoon and saw another by Edward Pearce - The elder Pitt, Man of War.

In the words of '1066 and all that', quite a wave of Pitts

I thought this was a decent overview/survey: Nineteenth Century British Premiers by Dick Leonard.
Also: Melbourne by Lord David Cecil

And I've also seen Andrew Roberts' Salisbury: Victorian Titan highly recommended, but haven't yet found a reasonably affordable copy in the US.

When/if you're ready to take a break, something entertaining (from a slightly later period): The Autobiography of Margot Asquith.

In the same vein, and would be of interest to this group, right now I'm reading Perilous Question which is excellent.

jztemple,
I *just* picked that up at the library a couple of hours ago - glad to hear it's good.

You should add Norman Gash's biography of Lord Liverpool. I read this many years ago in college. It is a solid review of his career, but you may, over time, want something more detailed. Gash also wrote a biography of Peel, but I have not read this.

>8 Blythewood: Thanks, I actually have that bio, but I'm keeping an eye out for his other books.

Peter Stansky also did a short biography of Gladstone.

Dominick