Conditions Governing Access: Some of the correspondence files are restricted in accordance with the Data Protection Act. All users of the collection are required to complete a Researcher Undertaking Concerning Access under the Data Protection Act 2018 and General Data Protection Regulation (GDPR) to Archives Which Would Otherwise Be Closed. With this proviso, the collection is open for consultation by researchers using the Manuscripts Reading Room at Cambridge University Library. For further details on conditions governing access please contact mss@lib.cam.ac.uk. Information about opening hours and obtaining a Cambridge University Library reader's ticket is available from the Library's website (www.lib.cam.ac.uk).