Plymouth Devonport (UK Parliament constituency)
MPs 1918–2010

Election
Election
Member
Party
-
1918
Clement Kinloch-Cooke
Coalition Conservative
-
1922
Clement Kinloch-Cooke
Conservative
-
1923
Leslie Hore-Belisha
Liberal
-
1931
Leslie Hore-Belisha
Liberal National
-
1942
Leslie Hore-Belisha
National Independent
-
1945
Michael Foot
Labour
-
1955
Dame Joan Vickers
Conservative
-
Feb 1974
David Owen
Labour
-
1981
David Owen
Social Democrat
-
1988
David Owen
Social Democrat (1988)
-
1990
David Owen
Independent
-
1992
David Jamieson
Labour
-
2005
Alison Seabeck
Labour
-
2010
Constituency abolished: see Plymouth Moor View and Plymouth Sutton and Devonport
Constituency abolished: see Plymouth Moor View and Plymouth Sutton and Devonport

Question: How long did the longest-serving MP of Plymouth Davenport serve for and who was it?
Answer: One of Plymouth Devonport's longest serving MPs was the Conservative Dame Joan Vickers, who held the seat from 1955 until the Election of February 1974.