This constituency was created under the Representation of the People Act 1918. With exceptions in 1997 and 2001 the seat's margin of victory has been less than 20% of the vote; it has been consistently fought over between and won by the Conservative Party and the Liberal Democrats's candidate, and can be considered a marginal seat. In 1997 and 2001 the seat turned out strongly overall for the latter party. However, in the 2019 general election, the Conservatives won a large majority of 28.6% over the Liberal Democrat candidate. A third-placed candidate has not polled more in North Cornwall than 16.38%, which took place in 1951. The seat saw three years of defection of its Liberal MP to join the post-World War II Attlee Ministry however in 2015 saw the lowest share of the Labour Party's vote nationally – reinforcing a consistent result by a great majority supporting left-wing politics to vote for a Liberal and later Liberal Democrat at general elections since the seat's inception.
Boundaries
1918–1950: The Borough of Launceston, the Urban Districts of Newquay, Padstow, Stratton and Bude, and Wadebridge, the Rural Districts of Calstock, Camelford, Launceston, St Columb Major, and Stratton, and parts of the Rural Districts of Bodmin and Holsworthy. 1950–1974: The Borough of Launceston, the Urban Districts of Bude-Stratton, Newquay, and Padstow, the Rural Districts of Camelford, Launceston, and Stratton, and parts of the Rural Districts of St Austell and Wadebridge. 1974–1983: The Borough of Launceston, the Urban Districts of Bude-Stratton and Newquay, the Rural Districts of Camelford, Launceston, and Stratton, and parts of the Rural Districts of St Austell, and Wadebridge and Padstow. 1983–2010: The District of North Cornwall wards of Allan, Altarnun, Bodmin St Mary's, Bodmin St Petroc, Bude and Poughill, Camelford, Grenville, Lanivet, Launceston North, Launceston South, Lesnewth, North Petherwin, Ottery, Padstow and St Merryn, Penfound, Rumford, St Breward, St Endellion, St Minver, St Teath, South Petherwin, Stratton, Tintagel, Trigg, Wadebridge, and Week St Mary, and the Borough of Restormel wards of Edgcumbe, Gannel, Rialton, St Columb, and St Enoder. 2010–present: The District of North Cornwall. Historically four borough constituencies lay within the boundaries, three of which were abolished as 'rotten boroughs' by the Great Reform Act, 1832:
