Richard West, 7th Lord la Warre succeeded to the title of 4th Lord West [E., 1322] on 27 August 1450.1 He succeeded to the title of 7th Lord la Warre [E., 1299] on 27 August 1450.
Source:
[S37] Charles Mosley, editor, Burke's Peerage, Baronetage & Knightage, 107th edition, 3 volumes (Wilmington, Delaware, U.S.A.: Burke's Peerage (Genealogical Books) Ltd, 2003), volume 1, page 1075. Hereinafter cited as Burke's Peerage and Baronetage, 107th edition.