Includes correspondence with: Nicholas Budgen MP; Esmond Bulmer MP; Frederick ("Freddy") Burden MP (includes a letter of congratulation to MT on her becoming Party Leader, February 1975); Baroness (Elaine) Burton of Coventry (includes a letter of congratulation to MT on her becoming Party Leader, February 1975); Michael Evan Victor Baillie, 3rd Lord Burton (includes MT’s handwritten letter to Burton on the future of the Conservative Party in Scotland, 4 September 1975); Adam Butler MP (including a note for MT on his lunch with Vladimir Kotliar, Political Counsellor, Soviet Embassy, on 18 May 1977); and Richard Austen ("Rab") Butler, Lord Butler of Saffron Walden (includes his letter of congratulation to MT on her becoming Party Leader, February 1975, and a copy of her handwritten reply)