Garnder was first elected to Parliament on 12 July 1901 in an unopposed by-election in the constituency of Wokingham following the resignation of Oliver Young. He remained the seat's MP until it was abolished for the 1918 general election, when he became the MP for Windsor. He retired from Parliament at the 1922 general election. He lived at 'Spencers' at Maidenhead in Berkshire.
- The London Gazette: . 16 July 1901.
- Craig, F. W. S. (1983) . British parliamentary election results 1918-1949 (3rd ed.). Chichester: Parliamentary Research Services. ISBN 0-900178-06-X.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- Leigh Rayment's Historical List of MPs [self-published source][better source needed]
- Hansard 1803–2005: contributions in Parliament by Ernest Gardner
|Parliament of the United Kingdom|
|Member of Parliament for Wokingham
1901 – 1918
|Member of Parliament for Windsor
1918 – 1922
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