A book published by Ernest Shackleton's team goes under the hammer at Sotheby's. Meanwhile, Christie's is expecting over £400,000 for a photograph by Peter Beard.

A much sought-after timepiece by the renowned 17th-century London clock-maker Thomas Tompion goes under the hammer at Christie's.

Photographs that define our age come under the hammer at Sotheby's, including a work by Irving Penn that may fetch nearly a quarter of a million pounds.