The Pontypridd by-election of 1922 was held on 25 July 1922. The by-election was held due to the appointment of the incumbent Coalition Liberal MP, Thomas Arthur Lewis, as a Junior Lord of the Treasury. It was won by the Labour candidate Thomas Isaac Mardy Jones.[1] It was the last of only eight ministerial by-elections in the UK not to be retained by the incumbent. The requirement for MPs who were appointed as ministers to seek re-election was entirely abolished by the .[2]
^Craig, F. W. S. (1969). British parliamentary election results 1918-1949 (1 ed.). Glasgow: Political Reference Publications. ISBN0-900178-019. Page 562