The Alan Turing papers for sale at Christie's next week fit the Waverley criteria as listed on the DCMS web site.
Thus:
Department for Culture, Media and Sport
The Waverley criteria
History
Is it so closely connected with our history and national life that its departure would be a misfortune?
Aesthetics
Is it of outstanding aesthetic importance?
Scholarship
Is it of outstanding significance for the study of some particular branch of art, learning or history?