He never held any office in government and was one of the Maastricht Rebels against the embattled administration of John Major during the mid-1990s.
Walker began his cadet career in 1942 with 1707 (Dundee) Squadron of the Air Training Corps (ATC).
He was a staunch Eurosceptic who resigned as vice chair of the Scottish Conservatives in 1992 to vote against the Government's attempts to implement the Maastricht Treaty.
[2] In 1994, Walker was implicated in the Cash for Questions scandal that involved other Conservative MPs such as Neil Hamilton and Tim Smith.
[6][7] He was survived by his widow Mavis (née Lambert), who he married in 1956, as well as their three daughters (Clova, Fiona and Justine) and six grandchildren.