Kudos to Douglas Hurd for revivifying Robert Blake's splendid biography of Benjamin Disraeli--surely one of the most satisfying modern biographies, a perfect match of subject and chronicler. Looks to me like it is not in print in the US,, though Amazon will sell you a used hardcover for $3 or a new paperback for $164 (yep, you read that right--shipped from Japan: maybe they meant to price it in yen). Blake is also the author of another favorite of mine--The Conservative Party from Peel to Major, which, so far as I can tell, has never been in print in the United States (that's my review on the Amazon page, from back in my pre-blogging days). Looks like a nice new paperback available from Amazon.uk, though.
Hurd also touts Roy Jenkins on Gladstone , which is a good call, though I suspect Jenkins' Asquith is better. His other three choices--two by DR Thorpe--I never read.
Statement of interest: perhaps I do have a bias here. Blake's Disraeli was the first book I allowed myself to read after finished the bar exam, and after all those bar notes, I suppose anything would have seemed like a breath of fresh air.
Afterthought: if memory serves, it was Douglas Hurd who once told a reporter he intended to spend his Christmas holiday poring over the memoirs of the 14th Earl of Darby--a project which, if memory serves, struck the reporter as achieving some kind of standard for paralyzing dulness.