St Ives is a parliamentary constituency covering the western end of Cornwall and the Isles of Scilly. The constituency has been represented in the House of Commons of the UK Parliament since 2015 by Derek Thomas, a Conservative MP. The area's voters produced the 22nd closest result in the 2017 general election; a winning margin of 312 votes. Since 1992, the same locally leading two parties' candidates who were fielded (varying at different times) have won at least 27.2% of the vote each; the third placed candidate, that of the Labour Party, has fluctuated between 8.2% and 15.2% of share of the vote. Constituency profile The seat covers the southern end of Cornwall and the Isles of Scilly. Tourism is a significant sector in this former mining area. History St Ives has elected MPs to every Parliament since 1558, except for a brief period during the Protectorate. It was originally a mere parliamentary borough that returned two MPs until the Great Reform Act of 1832, when its representation was cut to a single member. In 1885 the borough was abolished, but the St Ives name was transferred to the surrounding county constituency. St Ives borough The borough established under Queen Mary consisted of the parish of St Ives in western Cornwall, a seaport and market town in which the main economic interests were fishing and the export of ores mined nearby. In 1831, the population of the borough was 4,776, and contained 1,002 houses. The franchise was initially restricted to the town corporation, but after a judgment in a disputed election in 1702 the right to vote was given to all inhabitants paying scot and lot; in the early 19th century this amounted to a little over 300 voters. This was a wide franchise for the period, and its reasonable size meant that St Ives was one of the few Cornish boroughs that could claim not to be rotten. Elections were usually contested. Local wealthiest families were able to exercise considerable influence on the outcome yet none was predominant. The result could rarely be taken for granted and it was necessary to court the voters assiduously. From the 17th century were three such families from the first: the Hobart family, the Praeds (at the time of Treventhoe manor), and the Dukes of Bolton (the Paulet family) – to which added by the mid 18th century the Stephens family. In 1751,