1933 Rhondda East by-election

The seat had become vacant when the Labour Member of Parliament (MP) Lt-Col David Watts-Morgan had died on 23 February 1933, aged 65.

The new Labour candidate, William Mainwaring, a local miners agent, was contesting a parliamentary election for the first time.

None of the leading Labour figures who had lost their seats at the last General Election expressed an interest in standing here.

As a result, the election campaign remained an essentially local affair.

William Mainwaring's victory started his parliamentary career which went on unbroken until 1959.