When Parliament was dissolved for the 1931 general election, Dudgeon resigned from the Liberal Party and contested the election as a New Party candidate. He finished 4th of 4 candidates, with 986 votes (a 2.0% share). He did not stand for Parliament again.
References
Craig, F. W. S. (1983) [1969]. British parliamentary election results 1918-1949 (3rd ed.). Chichester: Parliamentary Research Services. ISBN0-900178-06-X.