1966 General Election

Caerphilly

Labour hold / Onesimus Edwards
Party Candidate Votes Percent Change
 LabourEdwards, Onesimus26,33074.3%+2.2%
 ConservativeMaddocks, Ronald5,18214.6%-2.3%
 Plaid CymruHowell, John3,94911.1%+0.1%
Majority21,14859.7%+4.5%
Turnout35,46176.8%-1.6%
Swing+2.25%
By-election held due to the MP's death
Party Candidate Votes Percent Change
 LabourEvans, Alfred26,33057.8%-16.5%
 Plaid CymruWilliams, Philip14,27431.3%+20.2%
 ConservativeWilliams, Robert3,6878.1%-6.5%
 LiberalSadler, Peter1,2572.8%N/A
Majority12,05626.5%-33.2%
Turnout45,548INF%0%
Swing-18.35%
Note: These results are in comparison to the previous General Election
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