Captain Robert Scott's 1910 pocket diary is offered at Spink in London on July 13.

It's expected to sell for around £20,000-25,000 ($26,793-33,491).

Scott died on the return from the South Pole in 1912

The diary is written in Scott's own hand and dates to the months leading up to the ill-fated Terra Nova expedition (1910-1913).

It features short notes for his various appointments that year and offers an interesting insight into the planning of the journey.  

Christie's sold it for £27,500 ($36,840) in 2011, a figure it could well surpass.

Scott's attempt to be the first to reach the South Pole famously ended in disaster. He and his men were beaten there by a rival Norwegian team.

Scott and four other members of his expedition died on the return trip.

Scott's more famous diary, the one taken on the expedition and discovered in his tent after his death, is housed in the British Museum.

It ends: "I do not think we can hope for any better things now. We shall stick it out to the end, but we are getting weaker, of course, and the end cannot be far.

It seems a pity, but I do not think I can write more…For God's sake look after our people."

Memorabilia associated with Scott and the expedition is in high demand.

A letter he wrote to a friend while he lay dying in his tent sold for £163,250 ($261,050) in a 2012 sale at Bonhams.

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