premise: South Dorset is a constituency represented in the House of Commons of the UK Parliament since 2010 by Richard Drax, a Conservative. The constituency was created as a consequence of the Redistribution of Seats Act 1885, although the area covered has changed since then.
hypothesis: South Dorset is a historically conservative constituency.
reason: The current representative is conservative, but there is nothing in the text to indicate that the area has always been conservative.