I have asked Ed Vaizey, the Culture Minister, to step in and save these papers for the Nation should they be sold to an overseas bidder:
From Christie's web site:
TURING, Alan Mathison (1912-1954). A collection of Alan Turing's offprints formed by Prof. Maxwell Herman Alexander Newman (1897-1984), 1936-1954, comprising:
TURING'S FIRST PUBLISHED PAPER:
'Equivalence of left and right almost periodicity.' Offprint from: Journal of the London Mathematical Society, vol....