COPAC has a date of 1985 for the former title you mention
Main author: Samuel, Ian, 1915-
Title details: An astonishing fellow : the life of General Sir Robert Wilson / Ian Samuel.
Published: Bourne End : Kensal, c1985.
Physical desc.: ,252p.,p. of plates : maps,1facsim.,ports. ; 24cm.
Identifier: ISBN: 0946041350
Notes: Bibliography: p239-245. - Includes index.
Subject: Wilson, Robert Thomas, Sir, 1777-1849.
Wilson, Robert, Sir 1777-1849.
It's available in the British Library, and Cambridge and Southampton universities - neither of which are near to me I'm afraid