Marklew worked as a fish merchant in Grimsby, and became active in the Labour Party. He was elected to Grimsby Borough Council in 1928, and also served on the executive of the Social Democratic Federation.
Markley stood for the Labour Party in Grimsby at the 1929 United Kingdom general election, and then in Colne Valley at the 1931 United Kingdom general election. At the 1935 general election, he was elected in Colne Valley, defeating the sitting Liberal Party MP, Lance Mallalieu, by a majority of 3,779 votes.
He died in office in 1939 aged 65.
- Colne Valley Liberal Democrats: political history, Ernest Marklew
- Leigh Rayment's Peerage Pages [self-published source][better source needed]
|Parliament of the United Kingdom|
| Member of Parliament for Colne Valley
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