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Included in the lot are a selection of photographs taken by Lieutenant Frank Porter of the Arab Legion.
An unseen letter in which war hero TE Lawrence wrote 'some day that little business in Arabia will be famous' has been unearthed almost 100 years later.
The prophetic letter by the man who became known around the world as Lawrence of Arabia is accompanied by a rare photo of him in Arab
headdress and robes.
The letter is dated Christmas Day 1918 shortly after his return from Arabia at the end of the First World War and before he became a household name.
It is being sold tomorrow at Sotheby's for an estimated £15,000.